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OAU Post-UTME Mathematics 2021 (Batch B) Question 11

Question 11

Progressions

The common ratio of a Geometric Progression is 2. If the 5th term is greater than the 1st term by 45, find the 5th term

  1. A.3
  2. B.8
  3. C.45
  4. D.48
Show the answer and explanation

Answer: D (48)

Explanation

ar4 − a = 16a − a = 15a = 45, so a = 3 and the 5th term is 3 × 16 = 48.