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JAMB Mathematics 2010 Question 22

Question 22

Progressions

The 3rd term of an arithmetic progression is −9 and the 7th term is −29. Find the 10th term of the progression.

  1. A.44
  2. B.−165
  3. C.−44
  4. D.165
Show the answer and explanation

Answer: C (−44)

Explanation

a + 2d = −9 and a + 6d = −29 give d = −5 and a = 1. The 10th term = 1 + 9(−5) = −44.