You may solve the simple probability, “Given a set of n randomly chosen people, what is the probability of two people having same birthday?” You may also solve, “At least how many people need to be picked to make the probability 100% that at least two of them have same birthday?” Answer to the second question is […]

Doctor gave you two types of medicine tablets (pils) A and B, and asked you to take one from each daily. The two tablets are in different bottles and look exactly same One day, while taking the pills, you open Bottle-A and tap one pill out in your hand. Then you open the second bottle to […]

You are blindfolded and 10 coins are place in front of you on table. 5 are having their heads-side up and 5 are having their tails-side facing upward. You cannot tell which way they are by touching the coin. You are allowed to touch the coins and flip them as many times as you want. How […]

There are 10 prisoners are in 10 different cells of a prison. There is no way in which they can communicate with each other. Each night, the warden picks one of the 10 prisoners and that prisoner is supposed to spend the entire night in the central living room. There is one bulb in the living […]

Four glasses are placed on the four corners of a square rotating table. Each glass is either upright (up) or upside-down (down). You have to turn all the glasses in same direction (either all up or all down). There are following conditions You are blindfolded, At one time you can only change two glasses (and […]