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Question

Given that log(2)=0.3010, then the number of digits in the number 20002000 is :

A
6601
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B
6602
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C
6603
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D
6604
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Solution

The correct option is C 6603
Let y=20002000
log10y=2000log10(2000)
=2000(log102+log10(1000))
=2000(0.3010+3)
=2000(3.3010)
=6602.
Therefore, the number of digits will be
log10y+1
=6602+1
=6603

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