who is silent in the parliament?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Why do you find that most of the buildings are deprived of the 13th floor?

What number should come in place of the question mark below?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Can you solve below mathematical equation?

2^1234 - 2^1233

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

What brings you down but never up?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

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