Square trick!!

Imagine a grid comprising 20 X 20 squares. How many squares, of any size, in total?

Answer:
2870.

It consists of one 20*20 square, four 19*19 squares, nine 18*18 squares,.... and four hundred 1*1 squares which totals upto 2870.

We can even extend this concept to any number of square grids.

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