What is the next number in this series?

4,12,84,3612....

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

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

Can you solve below mathematical equation?

2^1234 - 2^1233

Which is the smallest number that you can write using all the vowels exactly once?

What's the only room from which no one can enter or leave

Can you divide the below-given shape into four equal and identical pieces?

What building has the most stories?

During which month do people sleep the least?