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If l(1) = (10.0 pm 0.1) cm and l(2) = (9...

If `l_(1) = (10.0 pm 0.1)` cm and `l_(2) = (9.0 pm 0.1)` cm , find the their sum , difference and error in each .

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`10.0 cm pm 0.2 cm`
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