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by aninditasivaram2406 » Tue Nov 13, 2007 8:56 am
Hi,

Have a doubt on this one. Will wait for someone to answer and then post my doubt. Dont want to confuse people.

If there are more than 2 nos. on a certain list, is each of the nos. on the list equal to 0?
1. The product of any 2 nos. on the list is equal to 0
2. The sum of any 2 nos. on the list is equal to 0
Answer is B.

Highlight to see the answer!
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by moneyman » Tue Nov 13, 2007 9:37 am
(1) says the product of any two numbers on the list is 0

Lets select a list say {0,0,0,2} here the product of any two numbers would be 0 but all numbers do not equal 0. Now lets select another list say {0,0,0,0} then the product of any two numbers would be 0 and all numbers equal 0.INSUFFICIENT.

(2) says the sum of any two numbers on the list would equal 0.This can be true only if all the numbers equal 0.For example lets select a list say {0,-2,2,0} here -2+2=0 but 2+0=2 .Try plugging in more numbers and you will see that the sum will not equal 0 unless all numbers are 0.Hence SUFFICIENT.

So the answer is B

Correct me if I am wrong
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by aninditasivaram2406 » Tue Nov 13, 2007 9:53 am
When the problem mentions "the sum of any 2 nos." in statement 2, does that mean all numbers should ultimately give the sum as 0 when added to any other no.?
Example - (2,-2,2,-2) will give 0 when 2 and -2 are added but not when 2 and 2 are added.
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by moneyman » Tue Nov 13, 2007 10:00 am
Exactly!! It means that when you add any two numbers in the list the result should ultimately be 0
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by enlightenment » Tue Nov 13, 2007 11:34 am
moneyman wrote:(1) says the product of any two numbers on the list is 0

Lets select a list say {0,0,0,2} here the product of any two numbers would be 0 but all numbers do not equal 0. Now lets select another list say {0,0,0,0} then the product of any two numbers would be 0 and all numbers equal 0.INSUFFICIENT.

(2) says the sum of any two numbers on the list would equal 0.This can be true only if all the numbers equal 0.For example lets select a list say {0,-2,2,0} here -2+2=0 but 2+0=2 .Try plugging in more numbers and you will see that the sum will not equal 0 unless all numbers are 0.Hence SUFFICIENT.

So the answer is B

Correct me if I am wrong
you're right on the money on this one.
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