How many 4-digit numbers greater than 5000 can be formed using the digits 2, 4, 5, 7 and 8 without repetition?
Correct answer B. 72
Explanation
The first digit must be 5, 7 or 8 (3 ways); the remaining three places are filled in 4 x 3 x 2 = 24 ways: 3 x 24 = 72.
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