In the given figure, the equivalent resistance between the points $A$ and $B$ is ............ $\Omega$
AIIMS 1999, Easy
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(b) ${R_{AB}} = {R_1} + \frac{{{R_2}{R_3}}}{{{R_2} + {R_3}}} + {R_4}= 2 + \frac{{4 \times 4}}{{4 + 4}} + 2 = 6\,\Omega $.
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