Asked by Jade

If no digits may be used more than once , how many 5 digits can be formed using only the digits 3, 8,1,2,5 ,7?
Answered by Steve
that is just the number of permutations of 5 things out of 6: 6P5 = 6!/1!
Answered by Lara Calrissian
Why is there an exclamation point though?
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