For the signal flow graph shown below, the transmittance between X2 an

1.	For the signal flow graph shown below, the transmittance between X2 and X1 is
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rsu</td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">efh</td></tr><tr><td style="text-align: center;">1 - st</td><td style="text-align: center;">1 - fg</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rsu</td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">efh</td></tr><tr><td style="text-align: center;">1 - fg</td><td style="text-align: center;">1 - st</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">efh</td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rsu</td></tr><tr><td style="text-align: center;">1 - ru</td><td style="text-align: center;">1 - eh</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rst</td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rsu</td></tr><tr><td style="text-align: center;">1 - eh</td><td style="text-align: center;">1 - st</td></tr></table>
Answer» B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">rsu</td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">efh</td></tr><tr><td style="text-align: center;">1 - fg</td><td style="text-align: center;">1 - st</td></tr></table>

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For the signal flow graph shown below, the transmittance between X2 and X1 is

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