Find the next number in the sequence

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

In which direction should the missing arrow point?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

There are forty elephants and they have forty-fore heads. How can this be possible?

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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK