What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

How many triangles are there on the puzzle below?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

What do you answer even though it never asks you questions?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?