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

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Manager
Joined: 23 Mar 2008
Posts: 217

Kudos [?]: 199 [0], given: 0

S is a set of integers such that i) if a in S, then -a is in [#permalink]

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31 Aug 2008, 02:34
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S is a set of integers such that
i) if a 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

Kudos [?]: 199 [0], given: 0

Intern
Joined: 16 Feb 2006
Posts: 30

Kudos [?]: 9 [0], given: 6

Location: ZURICH

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31 Aug 2008, 02:44
S is a set of integers such that
i) if a 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

Statement 1
1 is in S then -1 is in S
we cannot say anything about other members in set
not sufficient option

Statement 2
2 is in S then -2 is in S
and if 2 and -2 is in S then (2)x(-2 ) = -4 is in S

Hence option will be B
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Kudos [?]: 9 [0], given: 6

Re: DS: set   [#permalink] 31 Aug 2008, 02:44
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