If you say my name, I will no longer exist. What am I?

Can you solve below mathematical equation?

2^1234 - 2^1233

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

People make me, save me, change me, raise me. What am I?

What is the coolest letter in the alphabet?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What is the centre of gravity?

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?