What has no start, end, or centre?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

What number do you get when you multiply all of the numbers on a telephone's number pad?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Can you solve below mathematical equation?

2^1234 - 2^1233

Can you name four days which start with the letter 'T'?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Make a sentence consisting of three words that have the whole alphabet.

What is common among 11, 69, and 88?

Prove that twice of ten is the same as twice of eleven.