two resistance r1 and R2 are connected in parallel the equivalent resistance is

2(r1 + r2 ) / (r1r2)
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Equivalent resistance of two resistors connected in parallel:
1/R=1/R1+1/R2
​Therefore, R=1/(1/R1+1/R2)
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1/R =1/R1 + 1/R2
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R1R2/R1+R2
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