MathDB
Problems
Contests
National and Regional Contests
India Contests
India Pre-Regional Mathematical Olympiad
2016 India PRMO
13
13
Part of
2016 India PRMO
Problems
(1)
2016 preRMO p13, how many times 2 appears in {1,2,..,1000}
Source:
8/9/2019
Find the total number of times the digit ‘
2
2
2
’ appears in the set of integers
{
1
,
2
,
.
.
,
1000
}
\{1,2,..,1000\}
{
1
,
2
,
..
,
1000
}
. For example, the digit ’
2
2
2
’ appears twice in the integer
229
229
229
.
algebra
number theory