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Range of integers ques

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by Rahul@gurome » Tue Feb 01, 2011 12:43 am
Note that we have been asked the range for positive integers in the list.
Range is the difference between maximum and minimum value.
The integers in the list are -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7.
The minimum positive value is 1 and the maximum positive value is 7.
So the range of positive integers is 7 - 1= 6.
The correct answer is B.
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by mshameen » Tue Feb 01, 2011 12:50 am
Thanks. I dont know why but to me it appeared that 0-7 so range should be 7. Anyway, thanks. 6 is what the right answer appears to be on the GMATPrep software.
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by quaktar0004 » Tue Feb 01, 2011 6:54 am
Why isn't "0" included in this range? I too thought the answer should be 7: 7-0=7. Please advise.
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by Rahul@gurome » Tue Feb 01, 2011 6:53 pm
quaktar0004 wrote:Why isn't "0" included in this range? I too thought the answer should be 7: 7-0=7. Please advise.
The reason is that zero is considered neither positive or negative.
You have to take only the positive integers while calculating the range.
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by Everest » Tue Feb 01, 2011 8:17 pm
let's define the set = -4, -3, -2, -1, 0, 1 , 2 ,3, 4, 5, 6, 7 (12 integers)

Number of positive integers are = 1 , 2 ,3, 4, 5, 6, 7 (0 is neither positive not negative)


Range = max - min = 7 -1 = 6

IMO B
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by aleph777 » Wed Feb 02, 2011 12:33 pm
I'm confused here... The range isn't inclusive? I counted 1 through 7, inclusive. But to find the range you simply take max - min?

Thanks!
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by Rahul@gurome » Wed Feb 02, 2011 6:44 pm
aleph777 wrote:I'm confused here... The range isn't inclusive? I counted 1 through 7, inclusive. But to find the range you simply take max - min?

Thanks!
You don't have to take the number of elements between 1 and 7 inclusive.
You have to take the difference between maximum positive value which is 7 and minimum positive value which is 1.
This comes out to be 6.
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