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

(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) \(t_{24} t_{43} t_{32}+t_{44}\)

Transcribed Image Text:

Xz 143 123 X3 134 124 125 145X5 1 X6