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Questions  

 Let fx=x-2 and g(x)=f(f(f(f(x))))(n times ). If equation gx=k, k0,2 has 8  distinct solutions than value of n is equal to 

a
3
b
4
c
5
d
8

detailed solution

Correct option is B

If  n=1 then  fx =x-2      , number of solutions =2 ;   If  n=2 then   ffx=x-2-2 , number of solutions =4 ;If  n=3 then  fffx=x-2-2-2, number of solutions =6;  If n=4 then ffff  = x-2-2-2-2 ,number of solutions =8;

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