Reasoning - How to count SQUARE in a given IMAGE

Hello aspirants. 

Here we go with our TRICK. ‪#‎MissionTarget2016‬

How to count square of n×n blocks board 

( e.g. chess board is a 8×8 blocks board )

Our question is - count the square in a given image.

Solution.

This image contains 8×8 blocks

So total no. Of squares are

= 1^2 + 2^2 + 3^2 + 4^2+......+ 8^2

=1 + 4 + 9+ 16...........+ 64

Ans = 204 

Don't bother..need not to add a long series. Use this.

= n(n+1)(2n+1)/6

TRICK .... total number of squares in a n× n blocks board are

= 1^2+2^2+3^2..........+n^2

Use this to add

= n(n+1)(2n+1)/6

Please give your feedbacks.