As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.

Maths is your friend If you meet with him every day, he becomes your best friend. If you leave for a time he forget you and you forget him.

M4Math helped me a lot.

Thanks m4 maths for helping to get placed in several companies.
I must recommend this website for placement preparations.