Question

9.Consider two physical quantities measured as a and b respectively a=(31.2 ± 0.1)cm, b=(15.4 ± 0.1)cm. The
percentage error in the measurement of (a+b) is
(a) 0.51%
(b) 0.62%
(c) 0.2%
(d) 0.43%
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Answer 1

This is the answer of your question :)