JAMB Mathematics 2013 Objective — Question 19
Question 19 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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If the sum of the first two terms of a GP is 3, and the sum of the second and third terms is −6, find the sum of the first term and the common ratio.
- A. A. −5Correct
- B. B. 5
- C. C. −2
- D. D. −3
Explanation
a+ar=3, ar+ar²=−6; dividing: r(1+r)/(1+r)=r=−2; a=−3; a+r=−5.
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