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# S is a set of integers such that i) if a is in S, then

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Manager
Joined: 22 Apr 2003
Posts: 180
Followers: 1

Kudos [?]: 8 [0], given: 0

S is a set of integers such that i) if a is in S, then [#permalink]  04 Nov 2003, 16:52
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S is a set of integers such that
i) if a is in S, then тАУa is in S, and
ii) if each of a and b is in S, then ab is in S.
Is тАУ4 in S?
(1) 1 is in S.
(2) 2 is in S.
Manager
Joined: 26 Aug 2003
Posts: 233
Location: United States
Followers: 1

Kudos [?]: 2 [0], given: 0

B?

(2): If 2 is in the set then -2 has to be. If they're both in the set then -4 has to be.
Manager
Joined: 22 Apr 2003
Posts: 180
Followers: 1

Kudos [?]: 8 [0], given: 0

wonder_gmat wrote:
B?

(2): If 2 is in the set then -2 has to be. If they're both in the set then -4 has to be.

Yes! you are right!
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# S is a set of integers such that i) if a is in S, then

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