find equivalent resistance in figure
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equivalent resistance (1/r)=2÷(1÷(1/2r+1/r)+r)+1/r
=2÷(2r/3+r)+1/r
=2÷(5r/3)+1/r
=2*3/5r+1/r
=11r/5
therefore
5r/11
=2÷(2r/3+r)+1/r
=2÷(5r/3)+1/r
=2*3/5r+1/r
=11r/5
therefore
5r/11
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