Can you find a number that lies one third of the distance between 1/3 and 2/3?

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

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Different lights make me strange by changing me into different sizes. What am I?

How could a baby fall out of a twenty-story building onto the ground and live?

Only Highly Attentive Can Spot The Ladder In This Library In 7 Seconds! Can You?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Can you solve below mathematical equation?

2^1234 - 2^1233