The transmittance from A to B in the signal flow graph shown

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The transmittance from A to B in the signal flow graph shown in the figure is—

1. a
  1 + ab
2. b
  1 + ab
3. a
  1 – ab
4. b
  1 – ab

Correct Option: A

B = A a + B (– ab)
or
B + B (ab) = Aa
or

B =	Aa
	1 + ab

or

B	=	a
A	=	1 + ab