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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

What does below pictogram mean?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Move four matchsticks to the below square to form three squares?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Find the next number in the series below

21 32 54 87 131 ?