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If 3.8xx10^(-6) is added to 4.2xx10^(-5)...

If `3.8xx10^(-6)` is added to `4.2xx10^(-5)` giving due regard to significant figures, then the result will be

A

`4.58xx10^(-5)`

B

`4.6xx10^(-5)`

C

`4.5xx10^(-5)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
`3.8xx10^(-6)+4.2xx10^(-5)=3.8xx10^(-6)+42xx10^(-6)`
`=45.8xx10^(-6)=4.58xx10^(-5)=4.6xx10^(-5)`
(Round off to first decimal place)
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