If S equals 1 through 40, and A is a subset of S, such that no 2 elements of A have their sums divisible by 5, what is the maximum number of elements possible in A?
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If S equals 1 through 40, and A is a subset of S, such that no 2 elements of A have their sums divisible by 5, what is the maximum number of elements possible in A?
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