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Find out the value of resistance R in fig.

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Find out the value of resistance R in fig.
image
A. `100 Omega`
B. `200 Omega`
C. ` 50 Omega`
D. `150 Omega`
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Correct Answer - A
`((20R)//(20 +R))/(R ) = (20)/(10) or R = 20 Omega`
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