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Write (2n)! =2n(2n-1)(2n-2) …3.2.1. Then...

Write `(2n)! =2n(2n-1)(2n-2)` …3.2.1. Then combine the even factors and prove `(2n)! =2^n.n!.[1.3.5...(2n-1)]`

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A N EXCEL PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTION BANK
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  3. Write (2n)! =2n(2n-1)(2n-2) …3.2.1. Then combine the even factors and ...

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  10. Given that P(n, r)=n(n-1)(n-2)….to r factors If P(n, 4) = 20 P(n, 2),...

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  12. If ^9p5+5^9p4=^10pr.prove that r=5

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