Combinatoricsmedium
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How many 3-digit numbers can be formed using {1, 2, 3, 4, 5} if at least one digit must be 3?
How many 3-digit numbers can be formed using {1, 2, 3, 4, 5} if at least one digit must be 3?
How many 3-digit numbers can be formed using {1, 2, 3, 4, 5} if at least one digit must be 3?