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WAEC Mathematics 1991 (August) Question 22

Question 22

Progressions

The first term a of an A.P. is equal to twice the common difference d. Find, in terms of d, the 5th term of the A.P.

  1. A.4d
  2. B.5d
  3. C.6d
  4. D.a + 5d
  5. E.2a + 4d
Show the answer and explanation

Answer: C (6d)

Explanation

5th term = a + 4d = 2d + 4d = 6d.