Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

What always comes into a house through the keyhole?

What is the end of everything?

What is always in front of you but can’t be seen?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

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

ST ND RD TH '?'

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

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How many times did the coin land on heads?