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Sequence S consists of 24 nonzero integers. If each term in [#permalink]
30 Mar 2007, 13:31

Sequence S consists of 24 nonzero integers. If each term in S after the second is the product of the previous two terms, how much terms in S are negative?

(1) The third term in S is positive.
(2) The fourth term in S is negative.

as usual, later I post the answer. Please, explain!!!

Statement I:
the first 2 terms could be
P, P or (no N terms in the entire series this way)
N, N........ Cant tell...............insuff

Statement II:
The first 2 terms could be
N, P or
N, N

so the series could progress as
N P N N ..... or
N N P N........................................suff
both result in the same # of negative terms in the sequence.