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JAMB Mathematics 1989 Question 30

Question 30

Progressions

If −8, m, n, 19 are in arithmetic progression, find (m, n)

  1. A.1, 10
  2. B.2, 10
  3. C.3, 13
  4. D.4, 16
Show the answer and explanation

Answer: A (1, 10)

Explanation

From −8 to 19 is three equal steps: 3d = 27, so d = 9. Then m = 1 and n = 10.