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Mathematics, 05.12.2019 19:31 jadeandryna0609

If the operation is defined for all integers a and b by a@b = a + b - ab, which of the following statements must be true for all integers a, b and c?

i. a@b = b@a
ii. a@0 = a
iii. (a@b)@c = a@(b@c)

(a) i only
(b) ii only
(c) i and ii only
(d) i and iii only
(e) i, ii and iii

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