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Sunday, 01 March 2026
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Find to infinity, the sum of the sequence \(1, \frac{9}{10}, ...

Find to infinity, the sum of the sequence \(1, \frac{9}{10}, \left(\frac{9}{10}\right)^2, \left(\frac{9}{10}\right)^3,.....\)
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  • A 10
  • B 9
  • C 10/9
  • D 9/10
Correct Answer: Option A
Explanation:
\(a=1, r=\frac{9}{10}\\
S_n = \frac{a}{1-r}\\
S_n = \frac{1}{1-\frac{9}{10}}\\
=1\div \frac{1}{10}\\
=1\times \frac{10}{1}\\
10\)

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