why number 8549176320 is one of a kind?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Find the next number in the series below

21 32 54 87 131 ?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Find the next number in the series.
1 10 24 43 67 ?

Sweet & very intelligent katty has 8 puppets(Jane Bird Barbie Angel Colleen Nora Lass Missy).
All puppets are of different size. She arrange all puppets to face towards the guest and tell the guess the following clues :

* Jane has three puppets bigger on its left side
* Bird has two puppets smaller on its left side
* Barbie has one puppet bigger on its right side
* Angel has two puppets smaller on its right side
* Colleen has one puppet bigger on its left side
* Nora has one puppet smaller on its left side
* Lass has four puppets bigger on its right side
* Missy has three puppets smaller on its right side

Also some puppets are inside the bigger puppets.

Assuming you are the guest , can you tell the katty how the puppets are arranged ?

What is the next number in the series?

15 29 56 108 208 ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?