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Q.

If f(x+f(y))=f(x)+yx,yR and  f(0)=1, then  f(7)=

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a

7

b

1

c

0

d

1

answer is A.

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Detailed Solution

f(x+f(y))=f(x)+yx,yR    f(0)=1

Replace  x=0,y=0

f(0+f(0))=f(0)+0

f(1)=1

Replace  x=1,y=0

f(1+1)=f(1)+0

f(2)=1

 constant function

f(7)=1

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