## Dice game – 7 or 12?

*By admin On April 8, 2012 · 17 Comments*

Two people, ‘A’ and ‘B’ play a game of dice. 2 dices are continuously being thrown on the table. ‘A’ wins if 12 shows up, ‘B’ wins if two 7′s come up in consecutive throws. Game ends whenever there is a winner. What is the probability that ‘A’ wins?

## Find the subsets

*By admin On April 6, 2012 · 12 Comments*

You are given a set of ‘n’ unique numbers. What is the maximum number of subsets that you can form such that if any two random subsets is chosen, they have exactly one element in common?

## Fair or unfair?

*By admin On April 2, 2012 · 33 Comments*

Every person in this world (assume 7 billion people) has a fair coin except one. One person has a coin which has heads on both sides. A random person is chosen who flips his/her coin 100 times. If it comes out to be heads each time, what is the probability that the person has a fair coin?

## Last Ball

*By admin On March 25, 2012 · 16 Comments*

A bag has 20 blue balls and 14 red balls. Each time you randomly take two balls out (Assume each ball in the bag has equal probability of being taken). You do not put these two balls back. Instead, if both balls have the same color, you add a blue ball to the bag; if they have different colors, you add a red color to the bag. Assume that you have an unlimited supply of blue and red balls, if you keep on repeating this process, what will be the color of the last ball left in the bag? What if the bag has 20 blue balls and 13 red balls instead?

## Chameleon

*By admin On March 8, 2011 · 11 Comments*

At one point, a remote island’s population of chameleons was divided as follows:

- 13 red chameleons

- 15 green chameleons

- 17 blue chameleons

Each time two different colored chameleons would meet, they would change their color to the third one. (i.e.. If green meets red, they both change their color to blue.) Is it ever possible for all chameleons to become the same color? Why or why not?”

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