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R1=10Ω
Rr=?
-----------------------------------------------------
Rs=R1+R2
R2=Rs-R1=25Ω-10Ω=15Ω
1/Rr=1/R1+1/R2
1/Rr=1/10+1/15
1/Rr=3/30+2/30
1/Rr=5/30
Rr=30/5=6Ω