lf f(x)=9x9x+3 then f(11996)+f(21996)+……….+f(19951996)=
A
997
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B
997.5
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C
998
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D
998.5
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Solution
The correct option is C997.5 f(x)+f(1−x)=9x9x+3+91−x91−x+3=9x9x+3+9/9x(9/9x)+3=9x9x+3+93(9x+3)=3(9x+3)3(9x+3)=1 f(11996)+f(21996)+…+f(19951996) =f(11996)+…+f(9971996)+f(9981996)+f(1−9971996)+...+f(1−11996) =1+1+....+1+f(9981996) =997+f[12]=997+12=997.5