Combinatoricsmedium
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How many 4-digit numbers can be formed using the digits {1, 2, 3, 4, 5} if digits cannot be repeated?
How many 4-digit numbers can be formed using the digits {1, 2, 3, 4, 5} if digits cannot be repeated?
How many 4-digit numbers can be formed using the digits {1, 2, 3, 4, 5} if digits cannot be repeated?