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Evaluate (n!)/(r!(6-3)!) , where n=6,r=3...

Evaluate `(n!)/(r!(6-3)!)` , where n=6,r=3

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We have to evaluate `(6!)/(3!(6-3)!)" "`(n=6 and r=3)
`=(6!)/(3!3!)=(6xx5xx4xx3!)=5xx4=20`
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