What has no start, end, or centre?

Find the next number in the series below.

6 18 270 72090 ?

Why did Buffon take the goal with him after every Juventus match?

What is both possible and impossible at the same time?

What you cannot hold but it is yours?

What is the next number in this series?

4,12,84,3612....

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Do You See It?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?