5. How many four-digit numbers can be formed from the numbers 1, 3, 4, 5, 6, 8, and 9 if repetition of digits is not allowed? A. 720 B. 540 C. 360 D. 840
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Since repetition is not allowed, we have 6 choices for the thousands digit (1, 3, 4, 5, 6, 8). Show more…
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