Look at the addition of significant figures given belowThe result reported in this addition should be

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31.12

31.1

31.122

31.10

answer is B.

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Detailed Solution

The result cannot have more digits to the right of the decimal point than either of the original numbersHere, 18.0 has only one digit after the decimal point and the result should be reported only upto one digit after the decimal point which is 31.1.

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