MathematicsMedium178×since 2002Q5332Let S=2+67+1272+2073+3074+ .....S = 2 + {6 \over 7} + {{12} \over {{7^2}}} + {{20} \over {{7^3}}} + {{30} \over {{7^4}}} + \,.....S=2+76+7212+7320+7430+...... Then 4S is equal toA(73)2{\left( {{7 \over 3}} \right)^2}(37)2B7332{{{7^3}} \over {{3^2}}}3273C(73)3{\left( {{7 \over 3}} \right)^3}(37)3D7233{{{7^2}} \over {{3^3}}}3372Check answerSkip