Let S be a subset of \{1,2,3, \ldots, 30\} with the property that no pair of distinct elements in S has a sum divisible by 5 . What is the largest possible size of S ?
Answer Choices
A. 10
B. 13
C. 15
D. 16
E. 18
Let S be a subset of \{1,2,3, \ldots, 30\} with the property that no pair of distinct elements in S has a sum divisible by 5 . What is the largest possible size of S ?
Answer Choices
A. 10
B. 13
C. 15
D. 16
E. 18