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Q.

Suppose ⨍ : R→R is a function 1=2, ⨍2=6, and 

x+y=⨍x+kxy-2y2 for all x, yR then

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a

⨍ 'x=6x

b

⨍ 'x=⨍ x

c

⨍ 'x=6

d

⨍ 'x=6⨍ x

answer is D.

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Detailed Solution

f:RR, f(1)=2, f(2)=6 f(x+y)=f(x)+5xy-2y2 f(x+y)-f(x)y=kx-2y Lty0f(x+y)-f(x)y=kx f1(x)=kx x=y=1 f(2)=f(1)+k-2 6=2+k-2k=6 f1(x)=6x 

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