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Is the product of four consecutive even integers positive?

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Is the product of four consecutive even integers positive? [#permalink] New post 23 Jul 2010, 08:40
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Is the product of four consecutive even integers positive?

(1) The sum of these integers is positive but smaller than 20
(2) The product of the middle two of these integers is positive


[Reveal] Spoiler:
I got C

OA is A which i disagree can someone explain why its A

as for S1 we can have -2 0 2 4 sum is +ve and < 20 product is 0 which is not positive
[Reveal] Spoiler: OA

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Re: Tough DS on number properties [#permalink] New post 23 Jul 2010, 11:43
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rxs0005 wrote:
Is the product of four consecutive even integers positive?

The sum of these integers is positive but smaller than 20
The product of the middle two of these integers is positive


I got C

OA is A which i disagree can someone explain why its A

as for S1 we can have -2 0 2 4 sum is +ve and < 20 product is 0 which is not positive


In YES/No DS questions statement is sufficient if you can answer either definitive YES or definitive NO to the question

Is the product of four consecutive even integers positive?

First of all: the product of four consecutive even integers can be either 0 (when one of the eve integers is zero) or positive (when all integers are positive or negative).

(1) The sum of these integers is positive but smaller than 20:

If the greatest term is \geq{8}, eg {2,4,6,8}, then the sum will be equal or more than 20.
If the smallest term <-2, eg {-4,-2,0,2}, then the sum won't be positive.

Hence this statement gives only TWO possible sets {0,2,4,6} and {-2,0,2,4} --> sum<20 and product =0, so in either case the product is NOT positives. Sufficient.

(2) The product of the middle two of these integers is positive.

It's possible to have {0,2,4,6} --> product is zero OR {2,4,6,8} --> product is positive OR {-8,-6,-4,-2}--> product is positive. Not sufficient.


Answer: A.

Hope it's clear.
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Re: Tough DS on number properties [#permalink] New post 25 Sep 2013, 23:09
Bunuel wrote:
In YES/No DS questions statement is sufficient if you can answer either definitive YES or definitive NO to the question

Is the product of four consecutive even integers positive?

First of all: the product of four consecutive even integers can be either 0 (when one of the eve integers is zero) or positive (when all integers are positive or negative).

(1) The sum of these integers is positive but smaller than 20:

If the greatest term is \geq{8}, eg {2,4,6,8}, then the sum will be equal or more than 20.
If the smallest term <-2, eg {-4,-2,0,2}, then the sum won't be positive.

Hence this statement gives only TWO possible sets {0,2,4,6} and {-2,0,2,4} --> sum<20 and product =0, so in either case the product is NOT positives. Sufficient.

(2) The product of the middle two of these integers is positive.

It's possible to have {0,2,4,6} --> product is zero OR {2,4,6,8} --> product is positive OR {-8,-6,-4,-2}--> product is positive. Not sufficient.


Answer: A.

Hope it's clear.


Are negative numbers considered even or odd in GMAT?
I also chose A but because there is only one possibility here {0,2,4,6}.
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Re: Tough DS on number properties [#permalink] New post 25 Sep 2013, 23:52
Expert's post
TirthankarP wrote:
Bunuel wrote:
In YES/No DS questions statement is sufficient if you can answer either definitive YES or definitive NO to the question

Is the product of four consecutive even integers positive?

First of all: the product of four consecutive even integers can be either 0 (when one of the eve integers is zero) or positive (when all integers are positive or negative).

(1) The sum of these integers is positive but smaller than 20:

If the greatest term is \geq{8}, eg {2,4,6,8}, then the sum will be equal or more than 20.
If the smallest term <-2, eg {-4,-2,0,2}, then the sum won't be positive.

Hence this statement gives only TWO possible sets {0,2,4,6} and {-2,0,2,4} --> sum<20 and product =0, so in either case the product is NOT positives. Sufficient.

(2) The product of the middle two of these integers is positive.

It's possible to have {0,2,4,6} --> product is zero OR {2,4,6,8} --> product is positive OR {-8,-6,-4,-2}--> product is positive. Not sufficient.


Answer: A.

Hope it's clear.


Are negative numbers considered even or odd in GMAT?
I also chose A but because there is only one possibility here {0,2,4,6}.


An even number is an integer that is "evenly divisible" by 2, i.e., divisible by 2 without a remainder.

An odd number is an integer that is not evenly divisible by 2.

Thus, according to the above both negative and positive integers can be even or odd. For example, -2 is even and -3 is odd.

P.S. Zero is an even integer. Zero is nether positive nor negative, but zero is an even number.
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Re: Is the product of four consecutive even integers positive? [#permalink] New post 26 Sep 2013, 00:12
rxs0005 wrote:
Is the product of four consecutive even integers positive?

(1) The sum of these integers is positive but smaller than 20
(2) The product of the middle two of these integers is positive


[Reveal] Spoiler:
I got C

OA is A which i disagree can someone explain why its A

as for S1 we can have -2 0 2 4 sum is +ve and < 20 product is 0 which is not positive


Let the 4 munbers be 2n,2n+2,2n+4,2n+6

Case1 : 0<8n+12<20 => n=-1,0 and product is 0 in both cases which is not positive.

Case2 : (2n+2)(2n+4)>0 => n<-2 or n>-1. if n=0 product is 0, if n=100 product is positive, ie not conclusive.

therefore ans is A

Hope it helped...
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Re: Is the product of four consecutive even integers positive?   [#permalink] 26 Sep 2013, 00:12
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