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#2326 2012-12-03 18:41:59

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1662 is correct. Good work!

#1663. Which term of the Arithmetic Progression 3, 8, 13, 18 ..... is 78?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2327 2012-12-03 20:13:15

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2328 2012-12-04 18:19:42

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

#1664. If the 3rd and the 9th terms of an Arithmetic Progression are 4 and -8 respectively, which term of this Arithmetic Progression is zero?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2329 2012-12-04 18:26:32

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2330 2012-12-05 19:02:22

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1664 is correct. Neat work!

#1665. Two APs have the same common differences. The difference between their 100th terms is 100, what is the difference between their 1000th terms?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2331 2012-12-05 20:48:29

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2332 2012-12-06 18:46:15

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1665 is perfect. Neat work!

#1666. For what value of n, are the nth terms of two Arithmetic Progression : 63, 65, 67, .... and 3, 10, 17, .... equal?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2333 2012-12-06 19:16:30

John E. Franklin
Member
Registered: 2005-08-29
Posts: 3,588

Re: Oral puzzles


igloo myrtilles fourmis

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#2334 2012-12-06 21:51:05

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2335 2012-12-07 19:13:07

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi John E. Franklin and bobbym,

The solution #1666 is perfect. Neat job!

#1667. Determine the Arithmetic Progression whose third term is 16 and the 7th term exceeds the 5th term by 12.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2336 2012-12-07 19:19:50

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,016

Re: Oral puzzles

Hi ganesh


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#2337 2012-12-07 21:14:36

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2338 2012-12-08 19:31:11

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi anonimnystefy and bobbym,

The solution #1667 is correct. Good work!

#1668. Find the sum of the following Arithmetic Progression : 0.6, 1.7, 2.8,   to 100 terms.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2339 2012-12-08 20:58:27

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2340 2012-12-09 19:04:41

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1668 is perfect. Fabulous!

#1669. Find the sum of the Arithmetic Progression to 11 terms : 1/15, 1/12, 1/10, ......


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2341 2012-12-09 21:29:59

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2342 2012-12-10 19:37:37

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1669 is correct. Marvelous!

#1670. In an Arithmetic Progression, given a = 7, a[sub]13[/sub] = 35, find d and S[sub]13[/sub].


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2343 2012-12-10 19:44:21

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2344 2012-12-11 18:22:24

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1670 is correct. Good work!

#1671. In an Arithmetic Progression, given d = 5, S[sub]9[/sub] = 75, find a and a[sub]9[/sub].


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2345 2012-12-11 20:44:41

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2346 2012-12-12 18:59:20

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1671

#1672. The first and the last terms of an Arithmetic Progression are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2347 2012-12-12 19:28:28

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2348 2012-12-13 17:54:43

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1672 is correct. Brilliant!

#1673. If the sum of first 7 terms of an Arithmetic Progression is 49 and that of 17 terms is 289, find the sum of first n terms.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#2349 2012-12-13 20:53:27

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,282

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Online

#2350 2012-12-14 21:56:27

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,313

Re: Oral puzzles

Hi bobbym,

The solution #1673 is perfect. Good work!

#1674. Find the sum of the odd numbers between 0 and 50.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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