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WAEC Further Mathematics 2021 Question 26

Question 26

Sequences and Series

The first term of an Arithmetic Progression (A.P.) is 4 and the sum of the first three terms is 18. Find the product of the first three terms.

  1. A.292
  2. B.272
  3. C.192
  4. D.172
Show the answer and explanation

Answer: C (192)

Explanation

(3/2)(8 + 2d) = 18 gives d = 2, so the terms are 4, 6, 8 and their product is 192.