What does this simple rebus mean?

What does the below rebus riddle means?

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

You need to move three matchsticks to form three squares. Can you do it?

I travel all around the world but always stay in the corner. What am I?

Can you find out which options fits best with the missing column?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

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

Count the number of triangles in the below picture?