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WAEC Further Mathematics 2016 Question 18

Question 18

Sequences and Series

Given that −6, −2½, …, 71, is a linear sequence, calculate the number of terms in the sequence.

  1. A.20
  2. B.21
  3. C.22
  4. D.23
Show the answer and explanation

Answer: D (23)

Explanation

d = 3½. 71 = −6 + (n − 1)(3.5) gives n − 1 = 22, so n = 23.