100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

Why is 6 afraid of 7?

How many words can a pen with half refill write?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What brings you down but never up?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?