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vomhorizon
Joined: 03 Sep 2012
Last visit: 30 Mar 2018
Posts: 352
Given Kudos: 47
Location: United States
Concentration: Healthcare, Strategy
Schools: Duke '16 (A) McCombs '20 (A) Foster '20 (A)
GMAT 1: 730 Q48 V42
GPA: 3.88
WE:Medicine and Health (Healthcare/Pharmaceuticals)
01 Oct 2012, 07:08
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
70% (01:44) correct
30%
(01:34)
wrong
based on 666
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How many digits are required to number a book containing 200 pages ?
A) 200
B) 600
C) 492
D) 372
E) 250
A) 200
B) 600
C) 492
D) 372
E) 250
01 Oct 2012, 07:16
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vomhorizon
9 pages from 1 to 9 will require 9 digits;
90 pages from 10 to 99 will require 90*2=180 digits;
200-(90+9)=101 pages will require 101*3=303 digits.
Total: 9+180+303=492.
Answer: C.
06 Nov 2012, 08:06
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KevinBrink
Each page from 1 to 9, inclusive (so total of 9 pages) needs one digit;
Each page from 10 to 99, inclusive (so total of 90 pages) needs two digits (for example page 12 needs two digits: 1 and 2);
Each page from 100 to 200, inclusive (so total of 101 pages) needs three digits (for example page 123 needs three digits: 1, 2 and 3).
Hope it's clear.
