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OpenStudy (anonymous):
Using each digit once, how many seven digit numbers can you form with 1,2,3,4,5,6,7 what is the sum of all these numbers?
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OpenStudy (anonymous):
... OK. i understand the first part, but not why you're multiplying by 28
OpenStudy (anonymous):
oh.... k i'm an idiot
OpenStudy (anonymous):
thank you!
OpenStudy (zarkon):
that sum is too small
OpenStudy (zarkon):
the sum is 22399997760
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