why number 8549176320 is one of a kind?

They are three errirs in this question. Can you find them?

Solve the following series:
AZ, GT, MN, __, YB

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Can you place three balls such that the equation shown in the picture holds true?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?