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?

We have two identical balls in terms of diameter and weight. However, one of them is solid and the other is hollow.

Without knocking the ball, can you find the solid ball?

What is at the end of a rainbow?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

You can see it everyday, But cannot touch it at will. What is it?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?