Replace the question mark with the correct number in below Picture:

Solve the following series:
AZ, GT, MN, __, YB

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Spot 5 differences in two Christmas tree below:

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?