There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

What is so fragile that saying its name breaks it?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.