If the sum of the second, third and fourth terms
of a positive term G.P. is 3 and the sum of its
sixth, seventh and eighth terms is 243, then the
sum of the first 50 terms of this G.P. is :
${2 \over {13}}\left( {{3^{50}} - 1} \right)$
${1 \over {13}}\left( {{3^{50}} - 1} \right)$
${1 \over {26}}\left( {{3^{49}} - 1} \right)$
${1 \over {26}}\left( {{3^{50}} - 1} \right)$
Solution
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