|
Author |
Message |
|
TAGS:
|
|
|
Senior Manager
Joined: 06 Jul 2004
Posts: 480
Location: united states
Followers: 1
Kudos [?]:
6
[0], given: 0
|
Is the product of four consecutive even integers positive? [#permalink]
 30 Jul 2007, 22:39
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 smallest two of these integers is postive?
_________________
for every person who doesn't try because he is
afraid of loosing , there is another person who
keeps making mistakes and succeeds..
|
|
|
|
|
|
|
Senior Manager
Joined: 28 Jun 2007
Posts: 464
Followers: 2
Kudos [?]:
5
[0], given: 0
|
Both insufficient for me.
In hindsight, they might look to be sufficient. But the presence of zero in the even integers list will make both of em fail.
|
|
|
|
|
|
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5134
Location: Singapore
Followers: 9
Kudos [?]:
87
[0], given: 0
|
St1:
The 4 even integers could be 0,2,4,6 -> sum = 12. But product = 0
The 4 even integers could be 2,4,6,8 -> sum = 20. Out, since the sum must be less than 20. Sufficient.
St2:
Product of the smallest two even integer = positive. So we are pretty sure 0 is not in the list. The product of the four even integers must then be positive. Sufficient.
Ans D
|
|
|
|
|
|
Senior Manager
Joined: 28 Jun 2007
Posts: 464
Followers: 2
Kudos [?]:
5
[0], given: 0
|
Re: DI : product of the 4 integers. [#permalink]
30 Jul 2007, 22:55
Himalayan wrote: shoonya 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 smallest two of these integers is postive? C for me. Yeah you are right... I totally missed making the connection between the "sum is +ve" and the "product of 2 smallest is +ve"
|
|
|
|
|
|
Senior Manager
Joined: 28 Jun 2007
Posts: 464
Followers: 2
Kudos [?]:
5
[0], given: 0
|
ywilfred wrote: St1:
The 4 even integers could be 0,2,4,6 -> sum = 12. But product = 0
The 4 even integers could be 2,4,6,8 -> sum = 20. Out, since the sum must be less than 20. Sufficient.
St2:
Product of the smallest two even integer = positive. So we are pretty sure 0 is not in the list. The product of the four even integers must then be positive. Sufficient.
Ans D
Oooh... Looks like I missed the first one too. Its 2 AM and this is an indication that I should probably go and crash 
|
|
|
|
|
|
Director
Joined: 26 Feb 2006
Posts: 919
Followers: 3
Kudos [?]:
28
[0], given: 0
|
Re: DI : product of the 4 integers. [#permalink]
30 Jul 2007, 23:05
Himalayan wrote: shoonya 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 smallest two of these integers is postive? C for me. i should changed to A.
1: 4 consequtive integers could be : -2, 0, 2, and 4 or 0, 2, 4, and 6. in either case the product is not +ve. so suff.
2: it could be: (-6, -4, -2 and 0) or (-4, -2, 0 and 2) or (2, 4, 6, 8) or so on.. nsf.
|
|
|
|
|
|
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5134
Location: Singapore
Followers: 9
Kudos [?]:
87
[0], given: 0
|
ywilfred wrote: St1:
The 4 even integers could be 0,2,4,6 -> sum = 12. But product = 0
The 4 even integers could be 2,4,6,8 -> sum = 20. Out, since the sum must be less than 20. Sufficient.
St2:
Product of the smallest two even integer = positive. So we are pretty sure 0 is not in the list. The product of the four even integers must then be positive. Sufficient.
Ans D
Darn... missed out negative evens.. should be A.
|
|
|
|
|
|
Director
Joined: 16 May 2007
Posts: 552
Followers: 3
Kudos [?]:
10
[0], given: 0
|
yes it is A.
Stmt 2 fails in these 2 cases : -4,-2 0 2 and 2 4 6 8. Insuff
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
close
