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July 31, 2014

Homework Help: discrete math

Posted by carlton on Sunday, April 8, 2012 at 2:04pm.

Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, have the following properties:
(a) are divisible by 5 and by 7.


(b) have distinct digits.


(c) are not divisible by either 5 or 7.

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