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Calculate the equivalent resistance of t...

Calculate the equivalent resistance of the following network:

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Two 20 ohm resistors in parallel are connected to one 10 ohm resistor in series. For resistor in parallel.
`(1)/(R_(p))=(1)/(R_(2))+(1)/(R_(3))=1/20+1/20`
`(1)/(R_(p))=2/20=1/10 omega`
`R_(p)=10 omega` for resistor in series `R_("total")=R_(1)+R_(p)`
`=10 omega+10 omega=20 omega`
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