If \( l_{1}=(12.0 \pm 0.1) \mathrm{cm} \) and \( l_{2}=(8.5 \pm 0.5) \mathrm{cm} \) find \( \lef...

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If \( l_{1}=(12.0 \pm 0.1) \mathrm{cm} \) and \( l_{2}=(8.5 \pm 0.5) \mathrm{cm} \) find \( \left(l_{1}+l_{2}\right) \) and \( \left(l_{1}-l_{2}\right) \) with proper error limits.
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