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Senior | Next Rank: 100 Posts
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by hakyology » Sun Jul 06, 2008 11:51 am

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

A) 4
B) 100
C) 101
D) 1,000
E) 1,001

Please explain.


The answer is C.
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Source: — Problem Solving |
Junior | Next Rank: 30 Posts
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by onesome » Sun Jul 06, 2008 12:06 pm
well yes.. thats just fine.

If 10^1 has 2 digits
and 10^2 has 3
than 10^100 should have 101 .. :)
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