Find the next number in the sequence

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

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

In the image below, can you find the value of an angle(y)

What has to be broken before you can use it?

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 common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?