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R1=12Ω
Rs=?
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1/Rr=1/R1+1/R2
1/R2=1/Rr-1/R1
1/R2=1/4-1/12
1/R2=3/12-1/12
1/R2=2/12
R2=12/2
R2=6Ω
Rs=R1+R2=12Ω+6Ω=18Ω
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R2=6Ω; Rs=18Ω