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If L = 2.06 cm pm 0.02 cm , B = 1.11 cm ...

If L = 2.06 cm `pm 0.02 cm , B = 1.11 cm pm 0.03 cm `. What are (L+B) and (L-B) equal to ?

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`L + B = 3.17 cm pm 0.05 cm`
`L - B = 0.95 cm pm 0.05 cm`
Please note that actual values i.e., 2.06 cm and 1.11 cm are added in case of `(L + B)` and subtracted in case of `(L - B)`, but absolute errors are added in both cases.
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