Two marks exercise problems I — task. Mathematics State Board, Class 10.

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1. Find the sum of the first \(n\) terms of the G.P.

(i)

5, - 3, \frac{9}{5}, - \frac{27}{25}, ...

\(S_n\) \(=\)

\frac{i}{i} (i - {(\frac{i}{i})}^{i})

(ii) \(256, 64, 16, …\)

\(S_n\) \(=\)

\frac{i}{i} (i - {(\frac{i}{i})}^{i})

2. Find the sum of the first six terms of the G.P. \(5, 15, 45, …\)

Answer:

The sum of first six terms \(=\)

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3. Two marks exercise problems I