The transmittance from X to Y in the signal flow graph shown

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The transmittance from X to Y in the signal flow graph shown in the figure is—

1. 4/3
2. 1
3. 2/3
4. 1/3

Correct Option: C

y = 2x + (– 2y)
3y = 2x
y/x = 2/3
or
transmittance = 2/3