JAMB Mathematics 2023 Objective — Question 24
Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2023 Objective paper, with the correct answer and a full explanation.
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The second term of a G.P is 4 while the fourth term is 16. Find the sum of the first five terms.
- A. 62Correct
- B. 54
- C. 64
- D. 60
Explanation
r²=4 ⇒ r=2, a=2. S5=a(r⁵-1)/(r-1)=2(31)/1=62.
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