7. (7 pts.) Let A be the set of all 7-digit natural numbers which are divisible by 5 or contain no zeroes in their decim
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7. (7 pts.) Let A be the set of all 7-digit natural numbers which are divisible by 5 or contain no zeroes in their decim
7. (7 pts.) Let A be the set of all 7-digit natural numbers which are divisible by 5 or contain no zeroes in their decimal representation. What is the cardinality of A? (Note that a 7 digit number cannot start with 0).
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