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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 em are added in case of (L + B) and subtracted in case of L-B), but absolute eors are added in both cases.
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