One shortcut tricks I want to share.

Here One shortcut tricks I want to share...

1*1=1

2*2=4

3*3=9

4*4=16

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Carry on

One things observes here that

Any number square is = Previous number square + (double the number-1)

Means suppose 51 squares = 50 square (2500) + (51*2 -1)101

                        =2500+101

                        =2601