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`        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

Arun
23513 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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• Test paper with Video Solution
• Mind Map
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• NCERT Solutions
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• Previous Year Exam Questions