In the signal flow graph shown below, the value of the (C / R) ratio is (a)

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In the signal flow graph shown below, the value of the \(C / R\) ratio is

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(a) \(\frac{28}{57}\)
(b) \(\frac{40}{57}\)
(c) \(\frac{40}{81}\)
(d) \(\frac{28}{81}\)

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