Each resistance of the network shown in figure is \( r \). Net resistance between (a) \( a \) an...

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Each resistance of the network shown in figure is \( r \). Net resistance between
(a) \( a \) and \( b \) is \( \frac{7}{3} r \)
(b) \( a \) and \( c \) is \( r \)
(c) \( b \) and \( d \) is \( r \)
(d) \( b \) and \( d \) is \( \frac{r}{2} \)
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