Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#726 2008-11-06 00:26:18

great_math
Member
Registered: 2008-10-07
Posts: 5

Re: 10 second questions

ganesh wrote:

#770. How many zeros would 25! (factorial of 25) end in?

No. of zeros at the end of

So no. of zeros at the end of 25!=

Last edited by great_math (2008-11-06 00:27:06)

Offline

#727 2008-11-08 18:17:33

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

Solution to #770:

great_math, I am not too sure about the valadity of your formula.
Your answer is, however, correct!
Excellent!

#771. What is the sum of all the natural numbers less than 100 divisble by 3?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#728 2008-11-09 19:37:20

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#772. Fill in the Magic square with numbers from 1 to 9 such that the side totals and diagonal totals equal 15.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#729 2008-11-09 23:27:10

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: 10 second questions

Last edited by JaneFairfax (2008-11-10 01:04:23)

Offline

#730 2008-11-10 20:21:02

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

Solution to #772:

Excellent, JaneFairfax!

#773. What is the sum of all prime numbers betwen 1 and 30, both numbers included? Is the resultant a prime number?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#731 2008-11-17 02:25:13

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#774. Is 10001 a prime number?
(Additional 20 seconds allowed for answering this question) smile


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#732 2008-11-17 19:31:13

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#775. By selling 55 cups, a person gains an amount equal to the selling price of 11 cups. Find his profit percentage.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#733 2008-11-18 00:15:50

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#776. What is the value of

?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#734 2008-11-18 16:53:23

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#777. What is the value of

?

#778. Without actual multiplication, find the value of 103 x 97.

#779. Factorize:- 49a² + 70ab + 25b².

#780. Factorize:-

.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#735 2008-11-18 21:03:14

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#781. What is the square root of 176400?

#782. What is the square root of 39690000?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#736 2008-11-19 18:00:37

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#783. What is the value of
sinθ * cosθ * cosecθ * secθ * tanθ * cotθ when θ=45°?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#737 2008-11-20 00:36:24

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#784. What is the value of

?

#785. Find the real and imaginary parts of the following complex number:-

.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#738 2008-11-20 02:04:15

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: 10 second questions

Offline

#739 2008-11-20 17:32:29

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

Answer to #784:-
You are correct, JaneFairFax! Well done!


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#740 2008-11-20 17:46:25

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#786. Prove that

#787. If a, b, c are three consecutive natural numbers, prove that


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#741 2008-11-20 18:00:50

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#788. Find the 40th term of an Arithmetic Ptogression whose 9th term is 465 and 20th term is 388.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#742 2008-11-21 22:25:02

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#789. Find the nature of roots of

.

#790. Find the nature of roots of

.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#743 2008-11-22 18:15:14

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#791. Find the equation of the straight line passing through the intersection of 3x+4y=17 and 4x-2y=8 and perpendicular to 7x+5y=12.

#792. Find


if x=at² and y = 2at

#793. Find


if


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#744 2008-11-22 22:19:10

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#794. Two numbers are in the ratio 3:4. If 6 be added to each term of the ratio, then the new ratio will be 4:5. Find the numbers.

#795. What are 'relatively prime' numbers?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#745 2008-11-23 17:54:36

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#796.If U={1,2,3,4,5,6,7} where U is the Universal Set, A = {1,2,3}, B = {2,3,4} and C = {3,4,5,6}, verify that

and


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#746 2008-11-24 17:20:27

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#797. Prove that the two diagonals of a rhombus divide it into four congruent triangles.

#798. For two triangles to be similar, would it be enough if any two sides are proportional and any one angle of one triangle is equal to that of another?


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#747 2008-11-25 18:13:16

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#799. There are six vacancies in an Office. If 8 men and 5 women offertehmselves for the job, in how many ways can the posts be filled, if there's a condition that the vacancies should go half to men and half to women?

#794. If

, find


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#748 2008-11-26 01:54:49

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#795. The vectors

and
are perpendicular when

(1)a=2, c=3, b=-4
(2)a=4, b=4, c=5
(3)a=4, b=4, c=-5
(4)a=-2, b=3, c=4

#796.The slope of the normal to the curve y=3x² at the point where the x-coordinate is 2 is __________.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#749 2008-11-26 17:05:41

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#797. Compute A+B and A-B if

and

#798.Find the product of A and B if

and
.

#799. Find

if

.

#800. Identify if matrix A given below is a singular matrix.

.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

#750 2008-11-28 20:21:23

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,968

Re: 10 second questions

#801. Find the angle between the vectors

and
.

#802. What is the value of

?

#803.For what value of m are the two given vectors perpendicular to each other?

and
.

#804. If

, then what is the velocity when the acceleration is zero?

#805. What is the value of

?

#806.Express the complex number

in the polar form.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

Board footer

Powered by FluxBB