Decimal Notation-help needed!

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babachal: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Mon Jun 02, 2008 5:30 pm; Thanked: 3 times

by babachal » Sat Jun 14, 2008 8:06 pm

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

Source: Beat The GMAT — Problem Solving | Sat Jun 14, 2008 8:06 pm

durgesh79: Master | Next Rank: 500 Posts; Posts: 167; Joined: Tue Apr 22, 2008 12:48 am; Thanked: 15 times

by durgesh79 » Sun Jun 15, 2008 2:21 am

In 10^1 = 10 - 2 digits
In 10^2 = 100 - 3 digits
In 10^3 = 1000 - 4 digits
.
.
In 10^100 = 101 digits.

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