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If n is an integer, which of the following must be even?

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If n is an integer, which of the following must be even? [#permalink] New post 18 Sep 2012, 01:55
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A
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C
D
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Re: If n is an integer, which of the following must be even? [#permalink] New post 18 Sep 2012, 01:55
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Re: If n is an integer, which of the following must be even? [#permalink] New post 18 Sep 2012, 02:16
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ans (C) 2n

n=1 => 2n = 2 =>even
n=2 => 2n = 4 => even
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Re: If n is an integer, which of the following must be even? [#permalink] New post 18 Sep 2012, 04:02
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Answer C

Any integer multiplied by an even number will always yield Even integer.
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Re: If n is an integer, which of the following must be even? [#permalink] New post 18 Sep 2012, 05:18
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Bunuel wrote:

If n is an integer, which of the following must be even?

(A) n+1
(B) n+2
(C) 2n
(D) 2n +1
(E) n^2




Since n is an integer, it can be EVEN or ODD.
But any integer when multiplied by 2 is even.
For example, 3 * 2 = 6 (even)
The rule is: EVEN * ODD = EVEN
EVEN * EVEN = EVEN
ODD * ODD = ODD

A) we cant say as it depends if n is odd or even
B) same as A)
C) Even as n is multiplied by 2
D) It is ODD as EVEN+1 = ODD
E) depends if n is even or odd.

Hence C
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Re: If n is an integer, which of the following must be even? [#permalink] New post 21 Sep 2012, 02:37
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SOLUTION

If n is an integer, which of the following must be even?

(A) n+1
(B) n+2
(C) 2n
(D) 2n +1
(E) n^2

ANY integer multiplied by even number yields even result, thus option C must be even.

Answer: C.

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Re: If n is an integer, which of the following must be even? [#permalink] New post 24 May 2014, 00:34
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I thought that an integer could be 0. If that is the case, then 2*(0), would equal 0, which is not equal an even number. Thus, it does not answer the question. Can someone please clarify? Thanks.
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Re: If n is an integer, which of the following must be even? [#permalink] New post 24 May 2014, 01:59
Answer: C
Any integer multiplied by an even number will always result in an Even integer.
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Re: If n is an integer, which of the following must be even? [#permalink] New post 24 May 2014, 02:13
Can you please clarify. My understanding is that 0 is an integer. If that the case you cant say any integer multiplied by an even number equals an even number. Because 0 multiplied by an even number equals 0, which is not an even number.

Im wondering if this question is erroneous. Shouldnt the question state any "if n is a positive or negative integer..."?
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Re: If n is an integer, which of the following must be even? [#permalink] New post 24 May 2014, 02:17
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momentofzen wrote:
Can you please clarify. My understanding is that 0 is an integer. If that the case you cant say any integer multiplied by an even number equals an even number. Because 0 multiplied by an even number equals 0, which is not an even number.

Im wondering if this question is erroneous. Shouldnt the question state any "if n is a positive or negative integer..."?


Zero is an even integer. Zero is nether positive nor negative, but zero is definitely an even number.

An even number is an integer that is "evenly divisible" by 2, i.e., divisible by 2 without a remainder and as zero is evenly divisible by 2 then it must be even (in fact zero is divisible by every integer except zero itself).

I think you should brush-up fundamentals on Number Theory: math-number-theory-88376.html

All DS Number Properties Problems to practice: search.php?search_id=tag&tag_id=38
All PS Number Properties Problems to practice: search.php?search_id=tag&tag_id=59

Hope it helps.
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Re: If n is an integer, which of the following must be even? [#permalink] New post 24 May 2014, 02:31
Thank you! I did not realize 0 was considered an even number. Appreciate it. Cheers.
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Re: If n is an integer, which of the following must be even? [#permalink] New post 10 Sep 2014, 07:55
Bunuel wrote:
If n is an integer, which of the following must be even?

(A) n+1
(B) n+2
(C) 2n
(D) 2n +1
(E) n^2

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Question: 44
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Any integer multiplied by 2 is always even,,, Hence C
Re: If n is an integer, which of the following must be even?   [#permalink] 10 Sep 2014, 07:55
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