A) \[\frac{7R}{4}\]
B) \[\frac{5R}{4}\]
C) \[\frac{9R}{4}\]
D) \[\frac{11R}{4}\]
Correct Answer: D
Solution :
[d] The figure can be redrawn as follows:
\[{{R}_{AB}}=R+\frac{3R}{4}+R=\frac{11R}{4}\]
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