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AMC 8
1991 AMC 8
11
11
Part of
1991 AMC 8
Problems
(1)
AJHSME 1991 Problem 11
Source:
6/24/2011
There are several sets of three different numbers whose sum is
15
15
15
which can be chosen from
{
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
,
9
}
\{ 1,2,3,4,5,6,7,8,9 \}
{
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
,
9
}
. How many of these sets contain a
5
5
5
?
(A)
3
(B)
4
(C)
5
(D)
6
(E)
7
\text{(A)}\ 3 \qquad \text{(B)}\ 4 \qquad \text{(C)}\ 5 \qquad \text{(D)}\ 6 \qquad \text{(E)}\ 7
(A)
3
(B)
4
(C)
5
(D)
6
(E)
7