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Question

What is the number of digits in 540? (Given log102 = 0.3010)

A

28

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B

27

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C

14

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D

13

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Solution

The correct option is A

28


log 540=40 log 5=40×[log(102)]=40(log 10log 2)
=40(10.3010)=40×0.6990=27.96.
Characteristic = 27. Hence, the number of digits in 540 is 28.


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