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The result of the operation 2.5 x 1.25 should be which of the following on the basis of significant figures?
  • a)
    3.125
  • b)
    3.13
  • c)
    3.1
  • d)
    31.25
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The result of the operation 2.5 x 1.25 should be which of the followin...
2.5 x 1.25 = 3.125
Since 2.5 has two significant figures, the result should not have more than two significant figures. Hence, the answer will be 3.1.
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Community Answer
The result of the operation 2.5 x 1.25 should be which of the followin...
Significant Figures:

Significant figures are the digits in a number that carry meaning contributing to its measurement resolution. The rules for determining significant figures when multiplying or dividing are as follows:

- The result should have the same number of significant figures as the factor with the least number of significant figures.

Therefore, in the given operation of 2.5 x 1.25, the factor with the least number of significant figures is 1.25, which has two significant figures. Hence, the result of the operation should also have two significant figures.

Calculation:

Multiplying 2.5 and 1.25, we get:

2.5 x 1.25 = 3.125

Since the factor with the least number of significant figures has two significant figures, the result should also have two significant figures. Therefore, the answer 3.125 should be rounded off to 3.1.

Therefore, the correct option is 'C' (3.1).
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