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Q.

Given that f(x)+f(11x)=2(12x)x(1x),xR,x0,1 then the given f(x) is 

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a

one-one  

b

many one

c

f(0) =1

d

f(2)=0

answer is A.

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Detailed Solution

f(x)+f(11x)=2x21x             …… (1)
     Now replace x by 11x we get  f(11x)+f(11x)=2(1x)2(11x)=2x+2x          …… (2)
     Replace x by 11x we get f(11x)+f(x)=2xx12x          …..  (3)
     From equation (1)(2)1  we get 
      Now,  f(x)f(11x)=2x21x                …. (4)
    From equation (3)+(4),we get

      Again, 2f(x)=2xx121x  
    f(x)=x+1x1  which is one-one function 

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