Mathematics, 10.11.2019 13:31 krlx

The set s consists of all odd multiples of 3: s = { -9, -3, 3, }. if the integers x and y are in s, then which of the following must also be in s?

a) xy
b) x + y
c) x - y
d) x/y
e) -x - y

explain too, .

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