MathematicsMedium110×since 2002Q3866A function f(x) is given by f(x)=5x5x+5f(x) = {{{5^x}} \over {{5^x} + 5}}f(x)=5x+55x, then the sum of the series f(120)+f(220)+f(320)+.......+f(3920)f\left( {{1 \over {20}}} \right) + f\left( {{2 \over {20}}} \right) + f\left( {{3 \over {20}}} \right) + ....... + f\left( {{{39} \over {20}}} \right)f(201)+f(202)+f(203)+.......+f(2039) is equal to :A392{{{39} \over 2}}239B192{{{19} \over 2}}219C492{{{49} \over 2}}249D292{{{29} \over 2}}229Check answerSkip