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JAMB Mathematics 2005 Question 47

Question 47

Permutation and Combination

In how many ways can 6 coloured chalks be arranged if 2 are of the same colour?

  1. A.60
  2. B.120
  3. C.240
  4. D.360
Show the answer and explanation

Answer: D (360)

Explanation

Arrange 6 items with 2 identical: 6!/2! = 720/2 = 360.