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Data Sufficiency Problem..

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Data Sufficiency Problem..

by odod » Tue Jan 20, 2009 11:08 am
Hello,

Got another one...


What is the least number of digits (including repetitions) needed to express 10^100 in decimal notation?

A) 4
B) 100
C) 101
D) 1000
e) 1001.

Answer is C.

Any idea how to get this? I'm not even sure where to start...
ODOD
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Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
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by yalanand » Tue Jan 20, 2009 12:06 pm
Its pretty easy

We know 10^1 = 10 (2 digits)
10^2=100(3 digits) in general

10^n=(n+1) digits

Hence 10^100 = 100+1=101 digits
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