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For the following system,

                  

when $X_{1} (s) = 0$, the transfer function $\frac{Y(s)}{X_{2}(s)}$ is

  1. $\frac{s+1}{s^{2}}\\ $
  2. $\frac{1}{s+1} \\$
  3. $\frac{s+2}{s(s+1)} \\$
  4. $\frac{s+1}{s(s+2)}$
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