How many four-digit numbers can be formed from the digits 1, 4, 5, 7, 8, and 9

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How many four-digit numbers can be formed from the digits 1, 4, 5, 7, 8, and 9

(a) If the numbers must be even and digits are not used repeatedly?

(b) If the numbers are less than 3000 and digits are not repeated?

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