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?

If an electric train is travelling south, then which way is the smoke going?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What is the below Rebus indicate?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

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?

Can you count the number of matches in the picture below ?

Which city is three-fifths chick two third cat and 50% goat?