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Chelsea04
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can someone remind me what the formula is for nPr and nCr?
 one year ago
 one year ago
Chelsea04 Group Title
can someone remind me what the formula is for nPr and nCr?
 one year ago
 one year ago

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ParthKohli Group TitleBest ResponseYou've already chosen the best response.3
\[nPr = \dfrac{n!}{(n  r)!} \ \ \ \ \quad nCr = \dfrac{n!}{(n  r)!r!}\]
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.3
Where \(n! = n \times (n  1) \times (n  2) \cdots 1\)
 one year ago

Chelsea04 Group TitleBest ResponseYou've already chosen the best response.0
oh right...my mind just blanked... Thank you @ParthKohli
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.3
For example:\[9C4 = \dfrac{9!}{(9  4)!4!} = \dfrac{9!}{5!4!} = \dfrac{9 \times 8 \times 7 \times 6}{4 \times 3 \times 2}\]
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.3
Charmed. :)
 one year ago
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