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Q.

 If f:RR is given by f(x)=9x9x+3nR then
f11996+f21996+..+f19951996

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a

997.5 

b

 998 

c

 997 

d

998.5

answer is A.

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Detailed Solution

 f(x)=9x9x+3nR  f(1-x)=91-x91-x+3=99+3·9x=33+9x f(x)+f(1-x)=9x9x+3+33+9x=1
f11996+f21996+..+f19951996  =f11996+f1-11996+f21996+f1-21996..+f9971996+f1-9971996+f12 1+1+1+.......+1+12=997.5

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