passwella.
Menu

WAEC Further Mathematics 2017 Question 24

Question 24

Permutations and Combinations

There are 7 boys in a class of 20. Find the number of ways of selecting 3 girls and 2 boys.

  1. A.1638
  2. B.2730
  3. C.6006
  4. D.7520
Show the answer and explanation

Answer: C (6006)

Explanation

13 girls: ¹³C₃ × ⁷C₂ = 286 × 21 = 6006.