Question
How many 4-digit even numbers can be formed using digits
1, 2, 3, 4, 5, 6 without repetition?Solution
Units digit even ⇒ {2, 4, 6} ⇒ 3 choices. Remaining 5 digits ⇒ P(5,3) = 5×4×3 = 60. Total = 3×60 = 180.
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