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If nP(r) = 11880 and nC(r) = 495 find...

If `nP_(r) = 11880 and nC_(r) = 495 ` find n and r .

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The correct Answer is:
n = 12
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Knowledge Check

  • If ""^(n)P_(r)=110 , then n + r =

    A
    21
    B
    19
    C
    13
    D
    11

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