Question 165369
When "order" is important we refer to it as a "permutation".
When "order" is NOT important we refer to it as a "combination".
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nPr = (n!)/(n-r)!
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In our case:
n = 7
r = 7
.
nPr = (n!)/(n-r)!
7_Pr_7 = (7!)/(7-7)!
7_Pr_7 = (7!)/(0)!
7_Pr_7 = (7!)/1
7_Pr_7 = (7!)
7_Pr_7 = (1*2*3*4*5*7)
7_Pr_7 = 840