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Q.

Let f be a function defined by f(x)=x-5x-3, x3, 2 fk(x) denote the composition of f with itself taken k time i.e f3x=fffx then

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a

f20092010=20052007

b

f20122012=2012

c

f20092009=10021003

d

f20122009=2009

answer is A, B, C, D.

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Detailed Solution

f(x)=x-5x-3ffx=2x-5x-2;  Let gx=ffx=2x-5x-2; is in the form ofax+bcx-a g(g(x))=x f4k(x)=x and f4k+1x=f(x) f2012(x)=xf2012(2009)=2009 and f2012(2012)=2012 f2009(x)=f(x)f2009(2009)=2009-52009-3=20042006=10021003 f2009(2010)=2010-52010-3=20052007    

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Let f be a function defined by f(x)=x-5x-3, x≠3, 2 fk(x) denote the composition of f with itself taken k time i.e f3x=fffx then