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# Seq s consists of 24 nonzero integres. If each term in S,

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Director
Joined: 08 Jul 2004
Posts: 596

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Seq s consists of 24 nonzero integres. If each term in S, [#permalink]

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07 Sep 2004, 14:49
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Seq s consists of 24 nonzero integres. If each term in S, after the second is the product of the previous 2 terms, how many terms in S are negative?
1 The third i s positve
2 The fourth term is negative
S

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Director
Joined: 05 May 2004
Posts: 574

Kudos [?]: 67 [0], given: 0

Location: San Jose, CA
Re: DS Sequence +ve -ve [#permalink]

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07 Sep 2004, 16:14
Has to be C
we need to know the sign for both first and second number

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Manager
Joined: 05 Sep 2004
Posts: 97

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07 Sep 2004, 16:17
Statement 1:

The third term can be positive if the first two terms are either both positive or both negative. If both positive, you'll not have a negative term in the 24 terms. If both negative, you'll have negative terms.

Thus, the first statement is insufficient.

Statement 2:

You can have a negative fourth term in of the following two situations:

(i) - + - -
(ii) - - + -

Apparently, then, there are two possible scenarios. In reality, both the scenarios will give you 16 negative terms in the first 24, and you can prove that by expanding the sequence.

Therefore, the second statement is sufficient.

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Director
Joined: 05 May 2004
Posts: 574

Kudos [?]: 67 [0], given: 0

Location: San Jose, CA

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07 Sep 2004, 16:28
intr3pid wrote:
Statement 2:

You can have a negative fourth term in of the following two situations:

(i) - + - -
(ii) - - + -

agree with you ... I made a silly mistake

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07 Sep 2004, 16:28
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