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JAMB Mathematics 1992 Question 20

Question 20

Progressions

For an arithmetical sequence, the first term is 2 and the common difference is 3. Find the sum of the first 11 terms.

  1. A.157
  2. B.187
  3. C.197
  4. D.200
Show the answer and explanation

Answer: B (187)

Explanation

S11 = 11/2 × [2(2) + 10(3)] = 11/2 × 34 = 187.