The sum of gain products of all possible combinations of two non-touching loops in the following signal

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The sum of gain products of all possible combinations of two non-touching loops in the following signal flow graph is:

image text in transcribed
(a) \(t_{23} t_{32} t_{44}\)
(b) \(t_{23} t_{32}+t_{34} t_{43}\)
(c) \(t_{23} t_{32}+t_{34} t_{43}+t_{44}\)
(d) \(t_{24} t_{43} t_{32}+t_{44}\)

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