Question: At a restaurant, how could you choose one out of three desserts with equal probability with the help of a single coin (could be biased)? Answer: If the coin […]

## Three Machine Guns

Question: A large group of zombies are coming towards you and there are three machine guns near you. Each machine gun has a different probability of firing bullets (say gun […]

## Three Hats Puzzle

Question: Three people enter a room and have a green or blue hat placed on their head. They cannot see their own hat, but can see the other hats. The […]

## Unfaithful Husband Puzzle

Question: A certain town has 100 married couples (husband and wife only). Everyone in the town lives by the following rule: If a husband cheats on his wife, the husband […]

## Drunk Man Puzzle

Question: There is a drunk man who is standing at the edge of the cliff. One step forward would send him over the edge. He takes random steps, either towards […]

## The Fox and the Duck

Question: A duck, that is being chased by a fox, saves itself by sitting at the centre of circular pond of radius r. The duck can fly from land but […]

## Birthday Pairings

What is the least number of persons required if the probability exceeds 1/2 that two or more of them have same birthday? (Year of birth need not match, and ignore […]

## N Consecutive Heads

Find expected number of coin tosses to get n consecutive heads. Let En denote the expected number of tosses to get n consecutive heads. Now if we get one more […]

## Egg Dropping Puzzle

Question: Figure out the highest floor of a 100-floor building an egg can be dropped without breaking, given two eggs. You are to determine the minimum number of attempts required in the […]

## Monty Hall Problem

Suppose you’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. […]