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What is the sum of a certain pair of consecutive odd

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What is the sum of a certain pair of consecutive odd [#permalink] New post 05 Aug 2006, 07:21
What is the sum of a certain pair of consecutive odd integers?
(1) At least one of the integers is negative.
(2) At least one of the integers is positive
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 [#permalink] New post 05 Aug 2006, 09:33
C

(1) At least one of the integers is negative.

=> 1 or more integer is negative
e.g. -1 , 1 = -1 + 1 = 0
but if -3 + -1 = 4

Not sufficient

(2) At least one of the integers is positive

=> 1 or more positive

Again, -1 + 1 = 0
Also, 1 + 3 = 4

Hence not sufficient.

But combining them atleast 1 positive and 1 negative (and they have to be consecutive odd numbers) then only possibilities -1 and +1.

Thus answer is 0 i.e. C
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Re: very confusing---paif of integer [#permalink] New post 05 Aug 2006, 10:15
ong wrote:
What is the sum of a certain pair of consecutive odd integers?
(1) At least one of the integers is negative.
(2) At least one of the integers is positive


(1) could be (-1,1) sum is zero
could be (-3,-1) sum is -4

Insuff BCE

(2) could be(1,3) sume is 4
could be (-1,1) sum is 0

Insuff CE
(1) & (2)
Has to be (-1,1) and sum is zero

Hence C
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 [#permalink] New post 05 Aug 2006, 17:20
C

both conditions together prove that the nos are -1 and
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 [#permalink] New post 05 Aug 2006, 17:54
gmatornot wrote:
C

(1) At least one of the integers is negative.

=> 1 or more integer is negative
e.g. -1 , 1 = -1 + 1 = 0
but if -3 + -1 = 4

Not sufficient

(2) At least one of the integers is positive

=> 1 or more positive

Again, -1 + 1 = 0
Also, 1 + 3 = 4

Hence not sufficient.

But combining them atleast 1 positive and 1 negative (and they have to be consecutive odd numbers) then only possibilities -1 and +1.

Thus answer is 0 i.e. C

OA is C ---thanks you
  [#permalink] 05 Aug 2006, 17:54
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