What is the word or phrase?

What will you call your mother's brother's brother-in-law?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What is the next number in this matchsticks series riddle?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Find out which of the given views in the picture is accurately the top view of the given pyramid.