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bmwhype2
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Is X even? 1. (x+1) * (x-2) is even 2. (x-3) * (x+5) is odd 12 Nov 2007, 12:49
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Is X even?

1. (x+1) * (x-2) is even
2. (x-3) * (x+5) is odd

Please explain your answer.



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Ravshonbek
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Is X even? 1. (x+1) * (x-2) is even 2. (x-3) * (x+5) is odd 12 Nov 2007, 13:04
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bmwhype2
Is X even?

1. (x+1) * (x-2) is even
2. (x-3) * (x+5) is odd

Please explain your answer.
Show more

picking numbers

B.

1. (x+1) * (x-2) is even ---> x can be odd and even

2. (x-3) * (x+5) is odd ---> x has to be even only
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bmwhype2
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Is X even? 1. (x+1) * (x-2) is even 2. (x-3) * (x+5) is odd 14 Nov 2007, 03:38
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Ravshonbek
bmwhype2
Is X even?

1. (x+1) * (x-2) is even
2. (x-3) * (x+5) is odd

Please explain your answer.
picking numbers

B.

1. (x+1) * (x-2) is even ---> x can be odd and even

2. (x-3) * (x+5) is odd ---> x has to be even only
Show more


nice. OA is B

i tend to be more comfortable with technical approaches.

Stem: Is X even?

1. shows products of two terms is even

this can only happen under 2 scenarios
a. e*o = e
b. e*e = e

(x+1) * (x-2) = E
under the first scenario:
x+1 must be even. This only occurs if x is odd.
x-2 must be odd. this only occurs if x is odd.
Therefore, X is odd.

under the second scenario:
]x+1 must be even. This only occurs if x is odd.
x-2 must be even. this occurs if X is even.
X is even or odd.

Therefore, A is insuff.

2. Same approach as 1.
SUFF

Therefore B.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!