SOLUTION: How many groups of seven can be made out the numbers 1 thru 15?

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Question 443968: How many groups of seven can be made out the numbers 1 thru 15?
Answer by rwm(914) About Me  (Show Source):
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15*14*13*12*11*10*9
the first has 15 possibilities
the second has 14 if there are no repetitions
etc till there are 7 in the group
if repetitions are allowed then 15^7 total