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Five-digit Divisibility
Problem
Using each of the digits 1, 2, 3, 4, and 5 exactly once to form 5-digit numbers, how many are divisible by 12?
Problem ID: 199 (10 Jan 2005) Difficulty: 2 Star
Using each of the digits 1, 2, 3, 4, and 5 exactly once to form 5-digit numbers, how many are divisible by 12?
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