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WAEC Mathematics 1997 Question 29

Question 29

Progressions

The eleventh term of an A.P. is 25 and its first term is −3. Find its common difference.

  1. A.1 9/10
  2. B.2 1/5
  3. C.2 3/11
  4. D.2 1/2
  5. E.2 4/5.
Show the answer and explanation

Answer: E (2 4/5.)

Explanation

T11 = a + 10d, so −3 + 10d = 25, 10d = 28, d = 2 4/5.