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Chelsea04

  • 3 years ago

can someone remind me what the formula is for nPr and nCr?

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  1. ParthKohli
    • 3 years ago
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    \[nPr = \dfrac{n!}{(n - r)!} \ \ \ \ \quad nCr = \dfrac{n!}{(n - r)!r!}\]

  2. ParthKohli
    • 3 years ago
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    Where \(n! = n \times (n - 1) \times (n - 2) \cdots 1\)

  3. Chelsea04
    • 3 years ago
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    oh right...my mind just blanked... Thank you @ParthKohli

  4. ParthKohli
    • 3 years ago
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    For example:\[9C4 = \dfrac{9!}{(9 - 4)!4!} = \dfrac{9!}{5!4!} = \dfrac{9 \times 8 \times 7 \times 6}{4 \times 3 \times 2}\]

  5. ParthKohli
    • 3 years ago
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    Charmed. :-)

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