Question: How many four-digit numbers can be formed from the digits 1, 3, 5, 7, 8, and 9 (a) If each digit may be used once

How many four-digit numbers can be formed from the digits 1, 3, 5, 7, 8, and 9

(a) If each digit may be used once in each number?

(b) If each digit may be used repeatedly in each number?

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