What is wrong in the below Picture?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Next Number in the Series,

5, 16, 49, 104, ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

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

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

ST ND RD TH '?'

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?