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​​​​For the block-diagram shown in the figure, the transfer function $\frac{C(s)}{R(s)}$ is

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