When 99 is considered higher than 100?

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?

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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find out the number of circles in the given picture having Illusion

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?