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Is x(y + z) > 0? 1) xyz > 0 2) yz > 0

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Manager
Joined: 28 Feb 2003
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Is x(y + z) > 0? 1) xyz > 0 2) yz > 0 [#permalink]

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19 May 2003, 00:13
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Is x(y + z) > 0?

1) xyz > 0
2) yz > 0
Intern
Joined: 15 Feb 2005
Posts: 23
Followers: 0

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

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25 Feb 2005, 12:48
brstorewala wrote:
Is x(y + z) > 0?

1) xyz > 0
2) yz > 0

Can someone explain how the answer is E...please. It seems to be like the answer is C.

1) None of x, y or z may be zero
2) Either both y and z are positive, or both negative.

Combining both, if both y and z are negative, x should be negative as well. That makes x(y+z) positive.

What am I missing...........
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Joined: 30 Sep 2004
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26 Feb 2005, 03:11
E)

1) +++ or --- or --+ or -+- or --+ => insuff
2) ++ or -- => insuff
1)+2) +(--) < 0 or +(++) > 0 => insuff
26 Feb 2005, 03:11
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