Rectangles

Probability Level 2

How many rectangles are there in a chessboard ?

648 1296 324 204

Prayag Jain by Prayag Jain , 21, India

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2 solutions

Rama Devi
May 21, 2015

The formula to calculate it is 9c2 X 9c2 ,which results in 1296.

2 Helpful 0 Interesting 0 Brilliant 0 Confused

We can use the formula, x = [ n ( n + 1 ) 2 ] 2 x=\left[\dfrac{n(n+1)}{2}\right]^2 . So

x = [ 8 ( 8 + 1 ) 2 ] 2 = 1296 x=\left[\dfrac{8(8+1)}{2}\right]^2=1296

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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