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 certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Find the next number in the series below

21 32 54 87 131 ?

One fine day, an intellectual man came to the emperor's court with the aim of testing Birbal's wittiness. In order to do this, he challenged Birbal to answer his question and hence prove that he was as intelligent and witty as he was said to be.
He asked Birbal, Do you want me to ask one difficult question or a hundred easy ones?
Since both Akbar and Birbal had had a tough day and were eager to leave, Birbal hastily told the intellectual to ask him a single difficult question.
Intellectual: OK. Tell me what came first into the world, the egg or the chicken?
Of course, the chicken, Birbal replied with a smile.
This time with a note of victory in his voice, the intellectual asked Birbal, How will you demonstrate that?
What did Birbal say?

What 5-letter word typed in all capital letters can be read the same upside down?

What is next number in the pattern below:

131 517 192 123 ?

The answer I give is yes, but what I mean is no. What was the question?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?