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Question Number 220872 by Spillover last updated on 20/May/25
Answered by mr W last updated on 21/May/25
$${P}_{{r}} ^{{n}} ={r}!×{C}_{{r}} ^{{n}} =\frac{{n}!}{\left({n}−{r}\right)!} \\ $$
Commented by Spillover last updated on 21/May/25
$${correct} \\ $$