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If r and s are positive integers, is r + s even?
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26 Apr 2019, 01:52
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If r and s are positive integers, is r + s even? (1) r is even. (2) s is even. DS76502.01 OG2020 NEW QUESTION
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Re: If r and s are positive integers, is r + s even?
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26 Apr 2019, 14:17
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
DS76502.01 OG2020 NEW QUESTION Questions dealing with even/odd properties can usually be solved Logically, with very little calculation. In particular, if (1) r is even, then if s is even then r+s = even + even = even but if s is odd then r+s=even+odd = odd. Insufficient. If (2) s is even, then we can use the exact same considerations as above to show this is insufficient. If both are even, their sum is even. (C) is our answer.
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Re: If r and s are positive integers, is r + s even?
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27 Apr 2019, 05:15
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
DS76502.01 OG2020 NEW QUESTION e=e+e e=o+o #1 r is even , s not know insufficeint #2 s = even , r not know from 1 & 2 r,s even so r+s = even IMO C
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Re: If r and s are positive integers, is r + s even?
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28 Apr 2019, 08:02
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
Given: r and s are positive integers Target question: Is r + s even? Statement 1: r is even. Since we have no information about s, we cannot determine whether r + s is even Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT Statement 2: s is evenSince we have no information about r, we cannot determine whether r + s is even Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT Statements 1 and 2 combined Statement 1 tells us that r is EVEN Statement 2 tells us that s is EVEN Since EVEN + EVEN = EVEN, we know that r + s is EVENSince we can answer the target question with certainty, the combined statements are SUFFICIENT Answer: C Cheers, Brent
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Re: If r and s are positive integers, is r + s even?
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28 Apr 2019, 13:10
Hi All, We're told that R and S are POSITIVE INTEGERS. We're asked if R+S is EVEN. This is a YES/NO question and can be solved with Number Properties and/or by TESTing VALUES. To start, you might find it helpful to write down a few Number Property rules: (Even) + (Even) = Even (Even) + (Odd) = Odd (Odd) + (Odd) = Even Since R and S are both INTEGERS, to end up with a sum that is EVEN, then BOTH numbers must either be EVEN or ODD. Otherwise, the sum will be ODD. 1) R is EVEN. IF... S = EVEN, then R+S will be EVEN. S = ODD, then R+S will be ODD. Fact 1 is INSUFFICIENT 2) S is EVEN. IF... R = EVEN, then R+S will be EVEN. R = ODD, then R+S will be ODD. Fact 2 is INSUFFICIENT Combined, we know... R is EVEN. S is EVEN. Thus, R+S must be EVEN and the answer to the question is ALWAYS YES. Combined, SUFFICIENT Final Answer: GMAT assassins aren't born, they're made, Rich
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Re: If r and s are positive integers, is r + s even?
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28 Apr 2019, 13:25
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
DS76502.01 OG2020 NEW QUESTION r and s are positive integers. (1) r is even.s could be even or odd. Insufficient (2) s is even. r could be even or odd. Insufficient Combine 1 & 2 r and s are positive EVEN integers. So r + s = even Sufficient Answer: C



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Re: If r and s are positive integers, is r + s even?
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02 May 2019, 17:25
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
DS76502.01 OG2020 NEW QUESTION We need to determine whether r + s is even. We may recall that either odd + odd = even or even + even = even. Statement One Alone: r is even Statement one alone is not sufficient. If s is even, then r + s is even; however, if s is odd, then r + s is odd. Statement Two Alone: s is even Statement two alone is not sufficient. If r is even, then r + s is even; however, if r is odd, then r + s is odd. Statements One and Two Together Since we know that both r and s are even, so r + s is even. Answer: C
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Re: If r and s are positive integers, is r + s even?
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09 May 2019, 02:18
Bunuel wrote: If r and s are positive integers, is r + s even?
(1) r is even. (2) s is even.
DS76502.01 OG2020 NEW QUESTION O+O=E and E+E=E, Whereas O+E=O. To find whether the sum of two numbers is even or not, we need to know E/O property of both the numbers. Since 1) and 2) gives E/O property of one number each, they are individually insufficient to answer the question. However, combining 1) and 2), we know the E/O property of both the numbers, therefore sufficient. Ans is C.




Re: If r and s are positive integers, is r + s even?
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09 May 2019, 02:18






