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WAEC Further Mathematics 2008 Question 31

Question 31

Permutations and Combinations

A test consists of 12 questions out of which candidates are to answer 10. If the first 6 questions are compulsory, in how many ways can each candidate select her questions?

  1. A.40
  2. B.25
  3. C.15
  4. D.10
Show the answer and explanation

Answer: C (15)

Explanation

After the 6 compulsory questions she chooses 4 more from the remaining 6: 6C4 = 15.