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Problem 6 - Entrance Test

The number of 4-digit numbers formed with digits 1,2,3,4,5 without repetition that are divisible by 3 is

Correct: A

Total sum 15. Only subsets of 4 digits with sum divisible by 3 are those leaving out 3 (sum 12). Choose 4 digits from {1,2,4,5}: 4! = 24.