JAMB Mathematics 2010 Objective — Question 21
Question 21 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2010 Objective paper, with the correct answer and a full explanation.
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21. Find the sum to infinity of the following series: 0.5 + 0.05 + 0.005 + 0.0005 + ... A. 5/11 B. 5/9 C. 5/8 D. 5/7
- A. 5/11
- B. 5/9Correct
- C. 5/8
- D. 5/7
Explanation
a=0.5, r=0.05/0.5=0.1. S(infinity) = a/(1-r) = 0.5/0.9 = 5/9.
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