Round off following number upto four significant figures.
$45.689$

45.689

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45.69

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45.68

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45.7

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Solution

The correct option is A $45.69$
The given number has $5$ significant figures.
As $9 > 5$ , thus the digit $8$ gets changed to $9$ after rounding off upto four significant figures.
$∴$ After rounding off, $45.689$ becomes $45.69$

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