February 20, 2017

Homework Help: math

Posted by ken on Sunday, October 19, 2008 at 1:28pm.

i asked a question yesterday and i got an answer. my question was how many 7 digit numbers can be formed with the numbers 1,2,4,7 if
a) repetation is allowed
b) repetation is not allowed
i got an answer but i needed 2 answers and im not sure if the answer was for a or b

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