There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of the box it labels. Opening just one box, and without looking in the box, you take [...]
You have given a two-arm balance scale and 9 identical looking balls. One of the ball is of different weight (heavier) than rest of the 8 balls. Find out the heavier weight ball by using two arm balance scale. You could use a pair of balance scales only twice. Solution [...]
A frog is at the bottom of a 30 meter well. Each day he summons enough energy for one 3 meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days [...]
Question : On island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight [...]
Question:Consider a two player coin game where each player gets turn one by one. There is a row of even number of coins, and a player on his/her turn can pick a coin from any of the two corners of the row. The player that collects coins with more value wins [...]
Let’s say that you have 25 horses, and you want to pick the fastest 3 horses out of those 25. In each race, only 5 horses can run at the same time because there are only 5 tracks. What is the minimum number of races required to find the 3 [...]
A bunch of people are living on an island, when a visitor comes with a strange order : all the blue-eyed people must leave the island as soon as possible. There will be a flight out at 8 PM every evening.Each person can see everyone else’s eye color, but they [...]
There is an 8 by 8 chessboard in which two diagonally opposite corners have been cut off.You are given 31 dominos, and a single domino can cover exactly two squares. Can you use the 31 dominos to cover the entire board? Answer: No This can be prooved using proof by [...]
You have a basketball hoop and someone says that you can play one of two games. Game1 : You get one shot to make the hoop. Game2 : You get three shots and you have to make two of three shots. If p is the probability of making a particular [...]
In a country where everyone wants a boy, each family continues having babies till they have a boy. After some time, what is the proportion of boys to girls in the country? (Assuming probability of having a boy or a girl is the same) Answer : The problem can be [...]