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Consider the following block diagram in the figure.

                 

The transfer function $\frac{C(s)}{R(s)}$ is

  1. $\frac{G_{1}G_{2}}{1+G_{1}G_{2}}$
  2. $G_{1}G_{2}+G_{1}+1$
  3. $G_{1}G_{2}+G_{2}+1$
  4. $\frac{G_{1}}{1+G_{1}G_{2}}$
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