You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

What is so fragile that saying its name breaks it?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What does this rebus mean?

O
N
C
E
TIME

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

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?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

How can you take 2 from 5 and leave 4?