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#2551 2014-05-06 20:08:48

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#2552 2014-05-07 17:05:18

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1767 is perfect. Excellent!

#1768. Find the sum of the following series 1 + 2 + 3 + ........ + 45.


Character is who you are when no one is looking.

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#2553 2014-05-07 21:20:54

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#2554 2014-05-08 17:08:37

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1768 is correct. Good work!

#1769. Find the sum of the following series : 16² + 17² + 18² + ......... + 25².


Character is who you are when no one is looking.

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#2555 2014-05-08 21:05:58

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2556 2014-05-09 17:13:38

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1769 is correct. Marvelous!

#1770. Find the sum of the following series : 2 + 4 + 6 + 8 + ......... + 100.


Character is who you are when no one is looking.

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#2557 2014-05-09 20:45:56

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#2558 2014-05-10 03:31:41

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1770 is perfect. Good work!

#1771. Find the sum of the following series : 7 + 14 + 21 + ........ + 490.


Character is who you are when no one is looking.

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#2559 2014-05-10 03:34:50

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 15,532

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

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#2560 2014-05-10 05:25:01

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#2561 2014-05-11 00:47:37

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi anonimnystefy and bobbym,

The solution #1771 is correct. Excellent, anonimnystefy and bobbym!

#1772. Find the sum of the following series: 16³ + 17³ + 18³ + ....... + 35³.


Character is who you are when no one is looking.

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#2562 2014-05-11 02:55:20

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2563 2014-05-11 16:08:39

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1772 is correct. Marvelous!

#1773. Find the value of k if 1³ + 2³ + 3³ + ...... + k³ = 2025.


Character is who you are when no one is looking.

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#2564 2014-05-11 16:12:26

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2565 2014-05-11 18:22:13

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1773 is perfect. Excellent!

#1774. Find the sum of the following series : 5² + 7² + 9² + ..... + 39².


Character is who you are when no one is looking.

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#2566 2014-05-11 19:18:02

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2567 2014-05-12 16:44:06

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1774 is correct. Excellent!

#1775. If 1 + 2 + 3 + ...... + p = 171 then find 1³ + 2³ + 3³ + ..... + p³.


Character is who you are when no one is looking.

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#2568 2014-05-12 20:24:42

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2569 2014-05-13 15:32:43

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1775 is correct. Brilliant!

#1776. If 1³ + 2³  + 3³  + .... + 8281, then find the value of 1 + 2 + 3 + ... + k.


Character is who you are when no one is looking.

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#2570 2014-05-13 19:12:32

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2571 2014-05-14 16:51:27

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1776 is perfect. Excellent!

#1777. Find the total area of 12 quares whose edges are 12 cm, 13 cm, 14 cm, .... and 23 cm.


Character is who you are when no one is looking.

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#2572 2014-05-14 19:19:39

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2573 2014-05-15 03:53:56

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1777 is perfect. Neat work!

#1778. Find the total volume of 15 cubes whose sides are 16 cm, 17 cm, 18 cm, .....30 cm.


Character is who you are when no one is looking.

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#2574 2014-05-15 05:34:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,776

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#2575 2014-05-15 16:38:56

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,459

Re: Oral puzzles

Hi bobbym,

The solution #1778 is correct! Stupendous!

#1779. Find the 8[sup]th[/sup] term of the sequence 1, 1, 2, 3, 5, 8, ....


Character is who you are when no one is looking.

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