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JAMB Mathematics 2013 Question 47

Question 47

Permutation and Combination

In how many ways can a student select 2 subjects from 5 subjects?

  1. A.5!/(2!3!)
  2. B.5!/2!
  3. C.5!/3!
  4. D.5!/(2!2!)
Show the answer and explanation

Answer: A (5!/(2!3!))

Explanation

Choosing 2 from 5 when order does not matter is 5C2 = 5!/(2! 3!).