Move four matchsticks to the below square to form three squares?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Whats the next number in the below number sequence pattern.

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?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What can you hold in your right hand, but never in your left hand?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

I am quite hot but become too cold if you remove the first two letters. What am I?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?