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‘Tis known in refined company, that choosing K things out of N can be done in ways as many as choosing N minus K from N: I pick K, you the remaining.
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this Q ans goes straight from the formula
nCr=nCn-r=n!/((n-r)!*r!)
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this Q ans goes straight from the formula
nCr=nCn-r=n!/((n-r)!*r!)
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