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GMAT Prep Question

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by pranaysad » Sat May 24, 2008 6:45 pm
If there are more than 2 numbers in a certain list, is each of the numbers in the list equal to 0?

1) The PRODUCT of any 2 numbers in the list is equal to 0
2 ) The SUM of any 2 numbers in the list is equal to 0

Could some please let me know how to solve this one?
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Source: — Data Sufficiency |
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Gmat Prep Question

by pranaysad » Sat May 24, 2008 6:52 pm
Sorry i think i figured this out finally. Funny the minute you post something it comes to you :)

Case 1. Product of any number is = 0
{0,5,0,0,0,0} Product of any 2 numbes is equal to 0.

Case 2: Sum of any number = 0

For the sum of any 2 numbers to be zero
-3,3
{ -3,3,3,3,3} does not work since 3+3 = 6
-3+3=0
0,3,0 does not work. Therefore all the numbers must be 0.

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by athinabean » Thu May 29, 2008 12:55 am
what if you have 3, -3, and 0? Problem says there are more than two numbers)
it works for both scenarios: their product is 0 and they add to cero. The not all need be 0....

I am I missing something?

oops. sorry my bad, you are right :)
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