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WAEC Mathematics 1998 Question 3

Question 3

Progressions

The nth term of a sequence is represented by 3 × 2(2−n). Write down the first three terms of the sequence

  1. A.3/2, 3, 6
  2. B.6, 3, 3/2
  3. C.3/2, 3, 1/3
  4. D.2/3, 3, 8/3
  5. E.3/2, 0, 6.
Show the answer and explanation

Answer: B (6, 3, 3/2)

Explanation

n = 1: 3 × 21 = 6; n = 2: 3 × 20 = 3; n = 3: 3 × 2−1 = 3/2.