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S is a set of integers such that
i) if a is in S, then -a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is -4 in S?
(1) 1 is in S.
(2) 2 is in S.
[spoiler]OA=B[/spoiler]
Source: GMAT Paper Tests
i) if a is in S, then -a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is -4 in S?
(1) 1 is in S.
(2) 2 is in S.
[spoiler]OA=B[/spoiler]
Source: GMAT Paper Tests
