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

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S is a set of integers such that i) if a is in S, then [#permalink] New post 04 Nov 2003, 17:52
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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.
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 [#permalink] New post 04 Nov 2003, 18:38
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.
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 [#permalink] New post 04 Nov 2003, 19:48
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!
Thank your explanation
  [#permalink] 04 Nov 2003, 19:48
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