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UI Post-UTME Mathematics 2018 (Model questions) Question 29

Question 29

Progressions

Find the sum to infinity of the GP 9 − 3 + 1...

  1. A.6
  2. B.12
  3. C.27
  4. D.6¾
Show the answer and explanation

Answer: D (6¾)

Explanation

a = 9, r = −1/3, so S∞ = 9 ÷ (4/3) = 27/4 = 6¾.