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The signal flow graph for a system is given below. The transfer function $\frac{Y(s)}{U(s)}$ for this system is given as 

  1. $\frac{s+1}{5s^2+6s+2}$
  2. $\frac{s+1}{s^2+6s+2}$ 
  3. $\frac{s+1}{s^2+4s+2}$
  4. $\frac{1}{5s^2+6s+2}$
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