If $400\; \Omega$ of resistance is made by adding four $100\; \Omega$ resistance of tolerance $5 \%$ then the tolerance of the combination is .....$\%$
AIEEE 2011, Medium
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$R _{ e }=4 R$
$\frac{\Delta R _{ e }}{ R _{ e }}=\frac{\Delta R }{ R }=5 \%$
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