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Question

If log10N=2.5 then find out total number of digits in N

A
3
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B
4
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C
5
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D
cannot be determined
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Solution

The correct option is A 3
log1010=1 , no of digit =2
log10100=2 , no of digit =3
log101000=3 , no of digit =4
As we can see from the above log10100=2 has 3 digit and log101000=3 has 4 digit.
In question it is given that log10N=2.5, that means it has a value which is greater than log10100=2 and less than log101000=3, so it will consist of 3 digits.

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