I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

Count the number of triangles in the below picture?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

If,

1 = 5 ,
2 = 25 ,
3 = 325 ,
4 = 4325

Then, 5 = ?

What do you call a fish without an eye?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

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

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

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

I have an eye but still cannot see.

Who am I?