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WAEC Mathematics 1995 Question 7

Question 7

Progressions

Find the nth term Un of the A.P., 11, 4, −3,........

  1. A.Un = 19 + 7n
  2. B.Un = 19 − 7n
  3. C.Un = 18 − 7n
  4. D.Un = 18 + 7n
  5. E.Un = 17 − 7n.
Show the answer and explanation

Answer: C (Un = 18 − 7n)

Explanation

a = 11 and d = −7, so Un = 11 + (n − 1)(−7) = 18 − 7n.