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

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

If eleven plus two equals one, what does nine plus five equal?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?