What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

You can see three almost identical images below. Can you spot the odd one out from them?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?