Brain Teasers

ganesh · 2009-03-04 04:04:03

#350. A person's is x[sup]th[/sup] in a row of n houses consecutively numbered 1, 2, 3, 4, 5, .... n. The sum of the numbers of the houses preceding his house is equal to the sum of the numbers following it. If x has the value 35, what is the value of n?

JaneFairfax · 2009-03-04 05:33:04

Last edited by JaneFairfax (2009-03-13 02:03:39)

ganesh · 2009-03-04 16:34:30

Answer to #350:-
Correct, JaneFairfax!

#351. In a party, all the guest shook hands with everybody else once except the host. The host had only 7 handshakes. How many guests were present at the party if the number of handshakes were 3 less than the least 4 digit number?

ganesh · 2009-03-07 02:43:50

#352. What is the value of

where n is a Natural number?

ganesh · 2009-03-07 18:39:00

#353. There are 4 oranges, 5 apples and 6 mangoes in a fruit basket. In how many ways can a person make a selection of fruits, from among the fruits in the basket?

#354. Ten points are marked on a straight line and Eleven points are marked on another line, parallel to the said straight line. How many triangles can be constructed with vertices among the above points?

ganesh · 2009-03-08 01:24:08

#355. a, b, and c are three positive numbers and

.
If (s-a) : (s-b) : (s-c) = 1 : 7 : 4, what is the ratio a:b:c equal to?

#356. If x:y = a:b = 1:5, then what is the value of

?

ganesh · 2009-03-08 01:54:55

#357. If each permutation of the digits 1, 2, 3, 4, 5, and 6 is listed in the increasing order of magnitude, what would the 289[sup]th[/sup] term be?

mathsyperson · 2009-03-08 02:34:11

ganesh · 2009-03-08 03:02:47

Answer to #357:-
mathsyperson:-

#358. How many intgeres between 6000 and 6999 (both included) have atleast one of their digts repeated?

#359. How many natural numbers less than a million can be formed using the digits 0, 7, and 8?

ganesh · 2009-03-12 03:31:16

#360. How many successive zeros would the product

end in?

#361. If N = 2[sup]8[/sup] x 5[sup]3[/sup], how many sets of two factors of N are co-prime to each other?

#362. How many successive zeros would there be at the end of

?

#363. Find the last non zero digit of 96!.

#364.What is the number in the unit's place of

?

#365. The numbers from 1 to 33 are written side by side as follows:-

.
What is the remainder when this number is divded by 9?

ganesh · 2009-03-13 02:03:05

#366. How many successive zeros would there be at th end of the product

?

#367. How many successive zeros would there be at the end of the product

?

ganesh · 2009-03-13 07:57:42

#368. What is the value of

?

#369. What is the value of

?

ganesh · 2009-03-13 20:10:57

#370. What is the remainder obtained when 4[sup]96[/sup] is divided by 6?

#371. What is the remainder when (15[sup]23[/sup] + 23[sup]23[/sup]) is divided by 19?

ganesh · 2009-03-13 20:14:37

#372. what is the number in the unit's place of

?

ganesh · 2009-03-15 07:15:23

#373. What are the values of x, y, and z equal to if they are all natural numbers and

?

Devantè · 2009-03-15 07:28:25

Devantè · 2009-03-15 07:31:13

Devantè · 2009-03-15 07:32:25

ganesh · 2009-03-15 21:16:08

Answers to #362, #365, and #372:-
Answer #365 is correct, Devantè!

ganesh · 2009-03-18 04:06:28

#374. Let n∈N, N>25 and A, G, and H denote the Arithmetic Mean, Geometric Mean, and Harmonic Mean of 25 and n respectively. What is the smallest value of n such that A, G, and H are in the set
{25, 26, ........ n}?

#375. Two finite sets have m and n elements respectively. The total number of subsets of the frst set is 56 more than the total number of subsets of the second set. What are the values of m and n respectively?

ganesh · 2009-03-19 09:43:52

#376. Find the sum of all odd numbers of four digits which are divisible by 9.

ganesh · 2009-03-20 04:22:49

#377. What is the value of

?

JohnnyReinB · 2009-03-21 02:48:08

ganesh · 2009-03-21 05:47:07

Answer to #375:
That's not the correct answer, JohnnyReinB!

ganesh · 2009-03-22 23:11:49

#378. The difference between the fourth powers of two natural numbers is 12240. The difference between the squares of the two numbers is one-one hundred and seventieth part of the difference between the fourth power of the two numbers. What are the two possible differences between the two natural numbers?

#426 2009-03-04 04:04:03

Re: Brain Teasers

#427 2009-03-04 05:33:04

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#428 2009-03-04 16:34:30

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#429 2009-03-07 02:43:50

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#430 2009-03-07 18:39:00

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#431 2009-03-08 01:24:08

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#432 2009-03-08 01:54:55

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#433 2009-03-08 02:34:11

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#434 2009-03-08 03:02:47

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#435 2009-03-12 03:31:16

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#436 2009-03-13 02:03:05

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#437 2009-03-13 07:57:42

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#438 2009-03-13 20:10:57

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#439 2009-03-13 20:14:37

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#440 2009-03-15 07:15:23

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#441 2009-03-15 07:28:25

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#442 2009-03-15 07:31:13

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#443 2009-03-15 07:32:25

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#444 2009-03-15 21:16:08

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#445 2009-03-18 04:06:28

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#446 2009-03-19 09:43:52

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#447 2009-03-20 04:22:49

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#448 2009-03-21 02:48:08

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#449 2009-03-21 05:47:07

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#450 2009-03-22 23:11:49

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