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Grade: 11
        
How many different rectangle s are there on a chess board?How many of these have area =3×area of small square
2 years ago

Answers : (1)

Arun
23032 Points
							

A rectangle is formed by two horizontal lines and 2 vertical lines. How many ways can you choose two vertical lines? Well there are 9 total. So 9c2. Order doesn't matter, which is why we use combinations . This equals 36.

How many ways can you choose two horizontal lines. There are 9c2. Again order doesn't matter, so we use combinations. It equals 36 again.

36 * 36 = 1296

2 years ago
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