(1) addition only - for addition, it makes no difference in what order you place the terms (i.e. 2 + 4 = 4 + 2), so yes: x@y will always equal y@x: sufficient.
(2) subtraction - for subtraction, order definitely matters (i.e. 2 - 4 does NOT = 4 - 2). so it depends on the values of x and y; if you pick x=y (e.g. x=y=2), then x-y=y-x; if you pick different values for x and y, then the two wilL NOT be equal. Maybe yes, maybe no: insufficient.
(1) is suff, (2) is insuff: choose (A).
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