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If xyz < 0 and z < 0, then which of the following must be true?

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If xyz < 0 and z < 0, then which of the following must be true?  [#permalink]

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New post Updated on: 20 Jan 2019, 02:17
1
1
00:00
A
B
C
D
E

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  15% (low)

Question Stats:

79% (01:00) correct 21% (00:52) wrong based on 31 sessions

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If xyz < 0 and z < 0, then which of the following must be true?

A. xy=1
B. xy<1
C. xy>-z
D. zy<z
E. xy>0

Originally posted by KSBGC on 20 Jan 2019, 01:58.
Last edited by Bunuel on 20 Jan 2019, 02:17, edited 1 time in total.
Renamed the topic and edited the question.
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Re: If xyz < 0 and z < 0, then which of the following must be true?  [#permalink]

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New post 20 Jan 2019, 08:43
selim wrote:
If xyz < 0 and z < 0, then which of the following must be true?

A. xy=1
B. xy<1
C. xy>-z
D. zy<z
E. xy>0

Let z = -1

Now, xyz < 0 => -xy < 0

Or, xy > 0 , Thus, Answer must be (E)
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Re: If xyz < 0 and z < 0, then which of the following must be true?   [#permalink] 20 Jan 2019, 08:43
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If xyz < 0 and z < 0, then which of the following must be true?

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