Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
A and B are integers. The expression (A+1)(B+1) is even. What can be
[#permalink]
Show Tags
05 Jul 2016, 12:21
1
6
00:00
A
B
C
D
E
Difficulty:
45% (medium)
Question Stats:
58% (01:04) correct 42% (01:08) wrong based on 217 sessions
HideShow timer Statistics
A and B are integers. The expression (A+1)(B+1) is even. What can be said about A and B?
A. They are both even numbers. B. At least one of them is even. C. At least one of them is odd. D. They are both odd. E. Nothing can be said surly on A and B
Re: A and B are integers. The expression (A+1)(B+1) is even. What can be
[#permalink]
Show Tags
05 Jul 2016, 13:20
Odd x Odd = Odd Odd x Even = Even Even x Even = Even
To fulfill condition Either (A+1) or (B+1) needs to be Even So either A or B needs to be odd Or Atleast one of them is odd.
Ans C. At least one of them is odd.
Good luck ========================================================================================= "If a street performer makes you stop walking, you owe him a buck" "If this post helps you on your GMAT journey, drop a +1 Kudo " _________________
Good luck ======================================================= "If a street performer makes you stop walking, you owe him a buck" "If this post helps you on your GMAT journey, drop a +1 Kudo "
Re: A and B are integers. The expression (A+1)(B+1) is even. What can be
[#permalink]
Show Tags
06 Jul 2016, 06:24
Bunuel wrote:
A and B are integers. The expression (A+1)(B+1) is even. What can be said about A and B?
A. They are both even numbers. B. At least one of them is even. C. At least one of them is odd. D. They are both odd. E. Nothing can be said surly on A and B
(A+1)(B+1) is even means that either A+1 or B +1 is even.
And if either A+1 or B +1 is even, then either A or B is odd because adding 1 will give us one even expression.
Hence C is the answer
_________________
I welcome critical analysis of my post!! That will help me reach 700+
Re: A and B are integers. The expression (A+1)(B+1) is even. What can be
[#permalink]
Show Tags
16 Aug 2016, 16:28
Top Contributor
Bunuel wrote:
A and B are integers. The expression (A+1)(B+1) is even. What can be said about A and B?
A. They are both even numbers. B. At least one of them is even. C. At least one of them is odd. D. They are both odd. E. Nothing can be said surly on A and B
Another approach is to systematically test all 4 possible cases:
case a: A is EVEN and B is EVEN The expression (A+1)(B+1) becomes (EVEN+1)(EVEN+1) = (ODD)(ODD) = ODD
case b: A is EVEN and B is ODD The expression (A+1)(B+1) becomes (EVEN+1)(ODD+1) = (ODD)(EVEN) = EVEN
case c: A is ODD and B is EVEN The expression (A+1)(B+1) becomes (ODD +1)(EVEN+1) = (EVEN)(ODD) = EVEN
case d: A is ODD and B is ODD The expression (A+1)(B+1) becomes (ODD +1)(ODD+1) = (EVEN)(EVEN) = EVEN
Since we're told that (A+1)(B+1) is even, we can rule out case a. So, cases b, c and d are all possible.
Now check the answer choices: A. They are both even numbers. Case d says otherwise. ELIMINATE A B. At least one of them is even. Case d says otherwise. ELIMINATE B C. At least one of them is odd. Yes. All all 3 possible cases, at least one value is ODD
Re: A and B are integers. The expression (A+1)(B+1) is even. What can be
[#permalink]
Show Tags
06 Jan 2019, 01:39
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
close
58% (01:04) correct 
