The result of the operation 2.5 X 1.25 should be which of the following on the basis of significant figures?

3.125

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3.13

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3.1

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31.25

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Solution

The correct option is C 3.1
$2.5 \times 1.25 = 3.125$

The rule says: Answer to a multiplication or division should be rounded off to a same number of significant figures as possessed by the least precise term in the calculation.

Since $2.5$ has least numbers of significant figure i.e.two, thus, the result should have 2 significant figure i.e. $3.1$
option C is correct

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