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WAEC Mathematics 2015 Question 5

Question 5

Progressions

Find the 7th term of the sequence: 2, 5, 10, 17, 26……

  1. A.37
  2. B.48
  3. C.50
  4. D.63
Show the answer and explanation

Answer: C (50)

Explanation

The terms are n² + 1, so the 7th term is 49 + 1 = 50 (the differences 3, 5, 7, 9, 11, 13 also give 37 + 13 = 50).