MacsenT
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can someone please explain these to me I feel like this is something I should actually understand rather than just knowing the formula
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RichE
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(Original post by MacsenT)
can someone please explain these to me I feel like this is something I should actually understand rather than just knowing the formula
It’s all about order.

nCr number of ways choosing r things from n.

nPr number of ordered ways of choosing r things from n.

First only cares about the r you end up with. Second cares about order they were chosen.
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MacsenT
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(Original post by RichE)
It’s all about order.

nCr number of ways choosing r things from n.

nPr number of ordered ways of choosing r things from n.

First only cares about the r you end up with. Second cares about order they were chosen.
still don't get it I'm afraid
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mqb2766
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(Original post by MacsenT)
still don't get it I'm afraid
https://www.mathsisfun.com/combinato...mutations.html
Is decent.
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