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

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?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

How many triangles can you count in the figure given?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

During which month do people sleep the least?

You can hear me, but you can't touch or see me.

What am I?

Can you count the number of squares in the figure below?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Which tank will fill first?