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WAEC Mathematics 1992 Question 6

Question 6

Progressions

The nth term of a sequence is given by 3.2n−2. Write down the first three terms of the sequence.

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

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

Explanation

The nth term is 3 × 2n−2. n = 1 gives 3 × 2−1 = 3/2; n = 2 gives 3 × 1 = 3; n = 3 gives 3 × 2 = 6.