cotpi

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Product of factors: http://cotpi/p/48/ Given the number of positive divisors of an unknown positive

Two mathematicians perform a trick with a shuffled deck of distinct cards. One mathematician asks a

The product of the tens digits of a few given perfect squares is odd. What is the units digit of the

Each square of a chessboard contains a number. The sum of the two largest numbers in each row is the

What is the largest integer n such that n! can not be expressed as the sum of n distinct factors of

For a given even positive integer, we create two lists of integers such that every positive integer

There is a 200-storey building. You are given 5 identical glass marbles. You are allowed to drop any

e^(27/e) -Ryan Batterman On Nov 26, 2011 5:56 AM, "Susam Pal" <su...@susam.in> wrote:

The ruler of a wealthy kingdom pays his mathematics tutor with gold coins every day. Every evening,

On Nov 15, 5:56 pm, Susam Pal <su...@susam.in> wrote: > On Nov 15, 11:20 am, Kunal Kishor

> There are two baskets containing the same number of balls. Each ball is > either red or blue.

The first basket has more RED balls, it has 13 at least. With natural numbers, the minimum values

If Alan is taking first turn then he can win definetely. He has to put first coin exactly at center.

A mathematics teacher narrated the most important story of his life to his students one day, "

On Sep 25, 4:41 pm, Vikram Agrawal (विक्रम अग्रवाल) <vragra...@gmail.com> wrote: > Answer is

A skilled artist once made a magnificent wax structure made of two wax cubes stacked on top of each

An easy but an ugly puzzle. There is a list of distinct numbers. There are at least two numbers in

There are 64 pawns placed on a chessboard. Each square contains a pawn. Two squares are neighbours of

There is a square board made of at least 4 equal-sized squares. The number of squares in the board is

What is the greatest power of 2 that divides 3^(2^1024) - 1? http://cotpi.com/p/19/

Here is a solution sent to me by Ryan Batterman: Let n be the number of friends in the group. Rip the

There is a list of 7 unique positive integers less than 10. One can not deduce whether their sum is a

http://cotpi.com/p/17/ (I first got this puzzle from Prunthaban.) There are 64 pawns placed on a

Each square of a chessboard contains a number that is equal to the average of the numbers in the

A puzzle from folklore: http://cotpi/p/15/ Arun, Bob and Charlie know that there are 3 red hats and 2

Every Sunday morning, Alice and Beth bake a huge pie together. After it is ready, Alice chooses a

Rolling coin: http://cotpi.com/p/13/ Some perfectly circular coins are placed in a nearly circular

Source: http://cotpi.com/p/12/ Four friends, Alice, Bob, Charlie and Dave, meet one Sunday afternoon

Puzzle from the last weekend: http://cotpi.com/p/10/ A person dies and meets God, the Devil and Bob