JAMB and WAEC Mathematics questions: Permutation and combination

22 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Permutation and combination· JAMB

   If ⁿC₂ = 15, find n.

   • A30
   • B5
   • C15
   • D6

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   Explanation and discussion

2. Question 22· Permutation and combination· JAMB

   A team of 3 is to be chosen from 5 boys and 4 girls. In how many ways can this be done if the team must include at least one girl?

   • A84
   • B74
   • C40
   • D10

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   Explanation and discussion