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UI Post-UTME Mathematics 2016 Question 17

Question 17

Progressions

How many terms has the A.P whose first term is 15 and the last term is 57 given that the common difference is 3?

  1. A.15
  2. B.21
  3. C.11
  4. D.14
Show the answer and explanation

Answer: A (15)

Explanation

57 = 15 + 3(n − 1), so n − 1 = 14 and n = 15.