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

what one word does the below rebus identifies?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

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?

The answer I give is yes, but what I mean is no. What was the question?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

What's a single-digit number with no value?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?