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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