Question: Two n-digit integers (leading zeros allowed) are considered equivalent if one is a rearrangement of the other. (For example, 12033, 20331, and 01332 are considered

Two n-digit integers (leading zeros allowed) are considered equivalent if one is a rearrangement of the other. (For example, 12033, 20331, and 01332 are considered equivalent five-digit integers.)
(a) How many five-digit integers are not equivalent?
(b) If the digits 1,3, and 7 can appear at most once, how many nonequivalent five-digit integers are there?

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