A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

What makes this number unique: 8,549,176,320?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

81 x 9 = 801. What must you do to make the this equation true?

There is an ancient kingdom where every married woman keeps information regarding the fidelity of other men. However, what they don't know is the fidelity of their own husbands. Also, there is an ancient belief that they don't tell each other about the fidelity of their husbands.

On a certain day, the queen of the kingdom declares that she has identified at least one unfaithful man in the kingdom. She allows the wives to identify and gives them authority to kill their husbands if they are unfaithful at midnight.

How will the wives manage it?

What begins with T, ends with T, and has T in it?

Can it be possible to build a house that has all its four walls facing towards the South?