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The sum to infinity of the series: 1 + (1/3) + (1/9) + (1/27) +...

Mathematics
JAMB 2002

The sum to infinity of the series: 1 + (1/3) + (1/9) + (1/27) + ... is

  • A. 11/3
  • B. 10/3
  • C. 5/2
  • D. 3/2
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Correct Answer: Option D
Explanation

The series is geometric with common ratio \(\frac{1}{3}\).

\(S_{\infty} = \frac{a}{1 - r}\)

= \(\frac{1}{1 - \frac{1}{3}} \)

= \(\frac{1}{\frac{2}{3}}\)

= \(\frac{3}{2}\)


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