Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

I travel all around the world but always stay in the corner. What am I?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Who are the happiest people in IPL match?

Can you count the number of triangles in the given picture?

What is so fragile that saying its name breaks it?

I look at you, you look at me, I raise my right, you raise your left. What am I?