BTGmoderatorLU wrote: ↑Thu Feb 06, 2020 3:47 pm
Source: Economist GMAT
Set Q contains n non-zero numbers. Does set Q contain an even number of negative numbers?
1) n is even.
2) The product of all the numbers in Q is 100,000
The OA is
B
Let's take each statement one by one.
1) n is even.
Certainly insufficient. All numbers can be positive; All except one number can be positive; All except two numbers can be positive. We have all the possibilities.
2) The product of all the numbers in Q is 100,000.
Since the product is positive, there must be an even number of negative numbers. If it is not so, then the product would be negative. For example: –2*–3*–5*–10 = +300; however, –2*–3*–5 = –30.
The correct answer:
B
Hope this helps!
-Jay
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