MathDB
Problems
Contests
National and Regional Contests
USA Contests
USA - College-Hosted Events
BMT Problems
2017 BMT Spring
5
2017 BMT Discrete #5
2017 BMT Discrete #5
Source:
March 9, 2024
combinatorics
Problem Statement
How many subsets of
{
1
,
2
,
.
.
.
,
9
}
\{1, 2,...,9\}
{
1
,
2
,
...
,
9
}
do not contain
2
2
2
adjacent numbers?
Back to Problems
View on AoPS