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Question

Given the numbers: 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers is

A
3, 3 and 4 respectively
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B
3, 4 and 4 respectively
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C
3, 4 and 5 respectively
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D
3, 3 and 3 respectively
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Solution

The correct option is D 3, 3 and 3 respectively
161 has three significant figures as all are non-zero digits.
0.161 has three significant figures as zero on the left of the first non-zero digit is not significant.
0.0161 also has three significant figures as zero on the left of the first non zero digit are not significant.

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