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Question

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 C 997.5
f(x)+f(1x)=9x9x+3+91x91x+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(19971996)+...+f(111996)
=1+1+....+1+f(9981996)
=997+f[12]=997+12=997.5

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