In the signal flow graph shown in the figure, the correct

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In the signal flow graph shown in the figure, the correct relationship between the various variables is—

1. w = au + bx + cy – du
2. w = au + bx + cy
3. w = au + cy + bx
4. w = au + cy + bx – dw

Correct Option: B

Since w is a mixed mode, this is due to the fact that branches leaving a mode does not affect the value of variable represented by that mode so,
w = au + bx + cy