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

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you find the thief by just looking at the picture below?

What part of the chicken has the most feathers?

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?