BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Decimal notation

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 882
Joined: Fri Feb 20, 2009 2:57 pm
Thanked: 15 times
Followed by:1 members
GMAT Score:690

Decimal notation

by crackgmat007 » Wed Aug 05, 2009 7:02 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

OA - C
Top
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 59
Joined: Mon Jul 13, 2009 8:58 pm
Thanked: 10 times
GMAT Score:710

Re: Decimal notation

by ankitns » Wed Aug 05, 2009 7:55 pm
The answer is C

Try to find a pattern here....

10^1 = 10 ( 2 digits)
10^2 = 100 (3 digits)
10^3 = 1000 (4 digits)
...
...

We will notice that the number of digits is alwaz 1 + the power that it is raised to.

[spoiler]Hence 10^100 -> 101 digits.[/spoiler]

Hope it helps.

Cheers.
crackgmat007 wrote: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

OA - C
Attempt 1: 710, 92% (Q 42, 63%; V 44, 97%)
Attempt 2: Coming soon!
Top
Legendary Member
Posts: 882
Joined: Fri Feb 20, 2009 2:57 pm
Thanked: 15 times
Followed by:1 members
GMAT Score:690

by crackgmat007 » Fri Aug 07, 2009 9:40 am
what does decimal notation mean?
Top
Post new topic Post Reply
• Page 1 of 1