Question: How many integers between 10000 and 1000000 have no digits other than 5, 7 or 9. How many have no digits other than 5, 7

How many integers between 10000 and 1000000 have no digits other than 5, 7 or 9. How many have no digits other than 5, 7 , 9 or 0.

(This is a combinatorics question)

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