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Judge the equivalent resistance when the...

Judge the equivalent resistance when the following are connected in parallel: `1 Omega`and `10^3Omega` and `10^6 Omega`

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`(1)/(R )=(1)/(1)+(1)/(10^(3))+(1)/(10^(6))=(10^(6)+10^(3)+1)/(10^(6))`
`=(1001001)/(1000000)`
`R=(1000000)/(1001001)=0.9Omega` (approx.)
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