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Answer the following question based on the information given below.
For a real number $x,$ let

 f(x) = 1/(1 + x), if x is non-negative = 1+ x, if x is negative f$^n$(x) = f(f$^{n – 1}$(x)), n = 2, 3, ....

$r$ is an integer $\geq 2.$ Then what is the value of $f^{r-1}(-r) + f^r(-r)+f^{r+1}(-r)$?

1. $-1$
2. $0$
3. $1$
4. None of these

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