The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you count the number of triangles inside a triangle?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Who has married many women but was never married?

what's the probability of getting a king or a queen from a pack of 52 cards?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.