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WAEC Mathematics 2002 Question 17

Question 17

Progressions

Find the nth term of the sequence 4, 10, 16,...

  1. A.2(3n − 1)
  2. B.2(2 + 3n−1)
  3. C.2n + 2
  4. D.2(3n + 2)
Show the answer and explanation

Answer: A (2(3n − 1))

Explanation

It is an A.P. with a = 4 and d = 6: Tn = 4 + 6(n − 1) = 6n − 2 = 2(3n − 1).