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.

#2501 2014-04-23 19:15:33

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2502 2014-04-24 14:37:05

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1745 is perfect. Good work!

#1746. If the product of three consecutive terms in Geometric Progression is 216 and the sum of their products in pairs is 156, find them.


Character is who you are when no one is looking.

Offline

#2503 2014-04-24 22:52:47

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2504 2014-04-25 16:26:27

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1746 is correct. Fantastic!

#1747. Find the first three consecutive terms in Geometric Progression whose sum is 7 and the sum of their reciprocals is

.


Character is who you are when no one is looking.

Offline

#2505 2014-04-25 20:00:02

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2506 2014-04-26 17:01:25

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1747 is correct. Excellent!

#1748. The sum of the first three terms of a Geometric Progression is 13 and the sum of their squares is 91. Determine the Geometric Progression.


Character is who you are when no one is looking.

Offline

#2507 2014-04-26 20:42:44

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2508 2014-04-27 17:48:51

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1748 is perfect. Stupendous!

#1749. Find the sum of the first 75 positive integers.


Character is who you are when no one is looking.

Offline

#2509 2014-04-27 19:50:27

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2510 2014-04-28 00:05:02

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1749 is correct. Neat work!

#1750. Find the sum of the first 125 natural numbers.


Character is who you are when no one is looking.

Offline

#2511 2014-04-28 02:02:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2512 2014-04-28 15:25:59

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1750 is correct. Neat job!

#1751. Find the sum of the first 30 terms of an Arithmetic Progression  whose n[sup]th[/sup] term is 3 + 2n.


Character is who you are when no one is looking.

Offline

#2513 2014-04-28 21:39:09

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2514 2014-04-29 00:26:01

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

#1752. Find the sum of the arithmetic series 38 + 35 + 32 + ........ + 2.


Character is who you are when no one is looking.

Offline

#2515 2014-04-29 01:44:26

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi ganesh;

Yes, I used the zeroth term. My mistake.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2516 2014-04-29 02:23:48

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1752 is correct. Good work!

#1753. Find the sum of the arithmetic series

25 terms.


Character is who you are when no one is looking.

Offline

#2517 2014-04-29 02:25:42

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;

Do you want it to 25 terms or 25 terms more?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2518 2014-04-29 02:43:17

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The problem requires 25 terms.


Character is who you are when no one is looking.

Offline

#2519 2014-04-29 02:49:29

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2520 2014-04-29 03:52:53

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

The solution #1753 is correct. Remarkable!

#1754. Find the S[sub]n[/sub] for the series : a = 5, n = 30, l = 121.


Character is who you are when no one is looking.

Offline

#2521 2014-04-29 04:47:59

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2522 2014-04-29 05:22:52

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,


Character is who you are when no one is looking.

Offline

#2523 2014-04-29 08:00:04

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi ganesh;

Thanks for the additional information.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

#2524 2014-04-29 17:17:26

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,276

Re: Oral puzzles

Hi bobbym,

#1755. Find the S[sub]n[/sub] for the following arithmetic series.
a (first term) = 50
n (number of terms) = 25
d (Common difference) = -4.


Character is who you are when no one is looking.

Offline

#2525 2014-04-29 20:56:02

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,210

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

Board footer

Powered by FluxBB