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

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

What word does this rebus represent?

meta meta
meta meta

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

I don't get anymore wetter, no matter how much rain falls on me.

Spot what is wrong here in below Picture?

Find the hidden tiger in the given optical illusion ?

1. Where does Easter come from before Valentine's Day?

2. Do you know what is in the middle of Valentine's?

3. What did the lady bee say to the man bee on the occasion of Valentine's Day

Why is 6 afraid of 7?