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Question

If for all x different from both 1 and 0 we have f1(x)=xx1,f2(x)=11x, and for all integers n1, we have fn+2(x)={fn+1(f1(x))ifnisoddfn+1(f2(x))ifniseven then f4 equals
  1. x
  2. x1
  3. f1(x)
  4. f2(x)

A
f1(x)
B
f2(x)
C
x1
D
x
Solution
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f3

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