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If a is a positive even integer, and ab is a negative even i
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17 Mar 2018, 07:24
17 Mar 2018, 07:24
Expert Reply
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Question Stats:
30% (00:39) correct
70% (00:28) wrong based on 30 sessions
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If a is a positive even integer, and ab is a negative even integer, then b must be which of the following?
A. A negative number
B. A negative even integer
C. A negative integer
D. A positive even integer
E. A positive integer
A. A negative number
B. A negative even integer
C. A negative integer
D. A positive even integer
E. A positive integer
Drill 2
Question: 4
Page: 497
Question: 4
Page: 497
Re: If a is a positive even integer, and ab is a negative even i
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18 Mar 2018, 06:57
18 Mar 2018, 06:57
Expert Reply
Explanation
The problem contains the phrase “must be,” so try to find numbers to plug in that disprove four of the five answer choices.
If a = 4 and ab = –12, then b = –3; eliminate choices (B), (D), and (E). Now determine whether b must be an integer. If a = 4 and ab = –2, then b
=\(\frac{-1}{2}\) ; eliminate choice (C), and you’re left with choice (A), the correct answer.
The problem contains the phrase “must be,” so try to find numbers to plug in that disprove four of the five answer choices.
If a = 4 and ab = –12, then b = –3; eliminate choices (B), (D), and (E). Now determine whether b must be an integer. If a = 4 and ab = –2, then b
=\(\frac{-1}{2}\) ; eliminate choice (C), and you’re left with choice (A), the correct answer.
gmatclubot
Re: If a is a positive even integer, and ab is a negative even i [#permalink]
18 Mar 2018, 06:57
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