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I thought we need (2) statement to make inference that Y is

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I thought we need (2) statement to make inference that Y is [#permalink] New post 28 Apr 2007, 07:01
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I thought we need (2) statement to make inference that Y is odd?
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 [#permalink] New post 28 Apr 2007, 08:36
(1) x(y+5) is even.
If y is even, x is even

If y is odd, x may or may not be even
(Insuff)
-----
(2) 6y^2 + 41y + 25 is even.
So, y is odd (An even y doesn't make the expression even)
(Insuff)

So, (1) and (2) together are NOT sufficient. Is this the answer?
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 [#permalink] New post 28 Apr 2007, 11:21
mNeo wrote:
(1) x(y+5) is even.
If y is even, x is even

If y is odd, x may or may not be even
(Insuff)
-----
(2) 6y^2 + 41y + 25 is even.
So, y is odd (An even y doesn't make the expression even)
(Insuff)

So, (1) and (2) together are NOT sufficient. Is this the answer?


Good explanation, and I second (E) same logic.

where o=odd e=even

statement 1

x(y+5) is even.
e(o+5) is even.
o(o+5) is even.

x could be either o,e - insufficient

statement 2

6y^2 + 41y + 25 is even.
6o^2 + 41o + 25 is even.

y is odd but x could be either o,e - insufficient

statements 1&2

still insufficient - knowing that y is odd - still can't say if x is even (see statement 1)
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Re: Another GMATprep DS [#permalink] New post 28 Apr 2007, 15:18
(1) x(y+5) = even. We cannot know for sure whether x is even, without having any info on y. Insuff => B, C, or E.

(2) 6y^2 + 41y + 25 = even. The 1st term is even in any case, therefore, for the whole exp to be even, y has to be odd (42*odd + odd = even). We don´t get any info on whether x is even => Insuff => C or E.

(1&2) If y is odd => y+5 is even => we still cannot state anything about x => E.
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 [#permalink] New post 28 Apr 2007, 20:22
Answer E

S1: not sufficient, y=1 and x=1|2 return is an even integer

S2: not sufficient, no relation with x

S1 & S2: not sufficient, S2 returns even only when y odd, and multiples of even are always even, irrespective of value of x. hence x can be odd or even.
  [#permalink] 28 Apr 2007, 20:22
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I thought we need (2) statement to make inference that Y is

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