SOLUTION: How many 5-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6 and 7 if repetition of the digits is not allowed? For example, there can not be 2 7’s

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Question 526086: How many 5-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6 and 7 if repetition of the digits is not allowed? For example, there can not be 2 7’s
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
nPr=n!/(n-r)!
7P5=7!/2!=2,520
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Ed