For the block diagram given in the following figure, the expression o – McqOptions

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1.	For the block diagram given in the following figure, the expression of C/R is:
A.	G1G2G3/1-G2G1
B.	G1G2/1-G1G2G3
C.	G1G2G3/1-G1G2G3
D.	G1G2/G3(1-G1G2)
Answer» B. G1G2/1-G1G2G3

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