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JAMB Mathematics 1997 Question 20

Question 20

Progressions

The nth term of a sequence is given by 31−n. Find the sum of the first three terms of the sequence.

  1. A.13/9
  2. B.1
  3. C.1/3
  4. D.1/9
Show the answer and explanation

Answer: A (13/9)

Explanation

The terms are 3⁰ = 1, 3⁻¹ = 1/3 and 3⁻² = 1/9. Their sum is 13/9.