Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Count the squares in the matchstick puzzle below?

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

What makes this number unique: 8,549,176,320?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

No matter how little or how much you use me, you change me every month. What am I?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

What building has the most stories?