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Q.

Let f: be a continuous function such that f(3x)f(x)=x. If f(8)=7 then f(4) is equal to

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a

11

b

16

c

10

d

4

answer is B.

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Detailed Solution

f(x)f(x/3)=x/3f(x/3)fx/32=x/32....on adding f(x)limnfx3n=x13+132+f(x)f(0)=x2f(8)=7;f(0)=3f(x)=x/2+3f(14)=10

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Let f:ℝ→ℝ be a continuous function such that f(3x)−f(x)=x. If f(8)=7 then f(4) is equal to