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

Why do we preferably have round manhole covers and not square ones?

Which word does the below Plexor means ?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?