If S is a set of integers and 5 is in S, is every multiple of 5 in S?
(1) If x is in S, then x+5 is in S
(2) If x is in S, then x-5 is in S![]()
(1) If x is in S, then x+5 is in S
(2) If x is in S, then x-5 is in S