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

What is the next number in this matchsticks series riddle?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Which word does the below Plexor means ?

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

Can you find the thief by just looking at the picture below?

What Time Should the last watch show in the below figure?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?