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Permutations

How many ways can you place 4 pictures in a line on a shelf?

Permutation problem:

$Equation=\frac{n!}{(n-r)!}$

n = number of choices

r = number of choices used

n = 4, there are 4 pictures

r = 4, we place 4 pictures

$\frac{4!}{(4-4)!}=\frac{4\times3\times2\times1}{0!}=24\ ways$

$0!=1$