Question: Answer the question using the given information and hints. In a street, there are five houses, painted five different colors. In each house lives a person of different nationality These five homeowners each drink a different kind of beverage, smoke different brand of cigar and keep a different pet. The Question: Who owns the... Continue Reading →

Question: A photon starts moving in the random direction from the center of the square of size 3. Let’s say it first colloids to the glass wall AB. What is the expected distance traveled by the photon before hitting the wall AB again? . . C A P T A I N I N T... Continue Reading →

Question: A bad king has a cellar of 1000 bottles of delightful and very expensive wine. A neighbor queen plots to kill the bad king and send a servant to poison the wine. Fortunately (or say, unfortunately) the bad king’s guards catch the servant after he could poison only one bottle. Alas, the guards don’t know which... Continue Reading →

Question: In a country in which people only want boys, every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country? . . C A P T A... Continue Reading →

Question: There are 7 prisoners sitting in a circle. The warden has caps of 7 different colors (an infinite supply of each color). The warden places a cap on each prisoner’s head – he can choose to place any cap on any other’s head. Each prisoner can see all caps but her/his own. The warden... Continue Reading →

Question: There are 10 incredibly smart boys at school: A, B, C, D, E, F, G, H, I and Sam. They run into class laughing at 8:58 am, just two minutes before the playtime ends and are stopped by a stern looking teacher: Mr. Rabbit. Mr. Rabbit sees that A, B, C, and D have mud... Continue Reading →