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      Question

      How many 4-digit even numbers using digits 1 to 6

      without repetition?
      A 120 Correct Answer Incorrect Answer
      B 180 Correct Answer Incorrect Answer
      C 100 Correct Answer Incorrect Answer
      D 160 Correct Answer Incorrect Answer

      Solution

      ATQ, Last digit (even): 2,4,6 → 3 choices Remaining 3 digits: 5×4×3 = 60 Total = 3×60 = 180

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