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If p, q, r are a series of three consecutive positive integers, is the

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If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 25 Nov 2014, 07:19
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Question Stats:

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Tough and Tricky questions: Number Properties.



If p, q, r are a series of three consecutive positive integers, is the sum of all the integers odd?

(1) Two of the three numbers p, q, r are odd numbers.
(2) (p + q + r)/3 is an even integer.

Kudos for a correct solution.

Source: Chili Hot GMAT

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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 25 Nov 2014, 07:30
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If p, q, r are a series of three consecutive positive integers, is the sum of all the integers odd?

(1) Two of the three numbers p, q, r are odd numbers.

Pick numbers (realize you have to start with an odd integer since you need two odd):

p = 1, q = 2, r = 3; sum = 1 + 2 + 3 = 6 (even) NO

odd + even + odd = always even

Statement 1 is sufficient to answer the question alone.

(2) (p + q + r)/3 is an even integer.

Realize that you need the numerator to be even since only even/odd = even; odd/odd = odd. Therefore, p + q + r = even.

Statement 2 is sufficient to answer the question alone.

Answer is D.
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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 25 Nov 2014, 09:20
1
(1) Two of the three numbers p, q, r are odd numbers.
sum of 3 consecutive numbers in which 2 are even will always be even [ coz odd+even+odd = even]
sufficient

(2) (p + q + r)/3 is an even integer.
let p = n-1
q = n
r = n+1
then p+q+r = 3n
(p + q + r)/3 = n= even then 3n will always be even
sufficient

in both the options the answer to the question is that sum of all the integers is not odd
[D]
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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 25 Nov 2014, 16:47
1
From the premise, we're trying to determine if we have o, e, o or e, o, e for the three integers. If the first integer is even, the sum is odd and if the first integer is odd, the sum is even.

From statement 1: two are odd, meaning we have odd, even, odd--sum = even. Sufficient.
From statement 2: basically the same thing, sum/3 = even, so sum must be even. Sufficient.

Choose D
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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 25 Nov 2014, 19:36
1
Statement 1: two of the three numbers p, q, r are odd numbers.

The series can be represented as : 2n+1, 2n+2, 2n+3 [where n is an integer, greater than equal to 0]

Sum = 6n + 6 = 2*(n+3) . Sufficient, since any integer multiplied by 2 yields an even integer.

Statement 2: (p + q + r)/3 is an even integer.

therefore, p + q + r = 3*2*n [n is an integer]

Sufficient, since any integer multiplied by 2 yields an even integer.


Answer should be D)
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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 26 Nov 2014, 00:11
1
Bunuel wrote:

Tough and Tricky questions: Number Properties.



If p, q, r are a series of three consecutive positive integers, is the sum of all the integers odd?

(1) Two of the three numbers p, q, r are odd numbers.
(2) (p + q + r)/3 is an even integer.

Kudos for a correct solution.

Source: Chili Hot GMAT



Answer D.
1) IF 2 integers are odd, then third is even, so sum is even. SUFFICIENT.
2) If average is even, then 2 integers are odd, so sum is even. SUFFICIENT.

Answer = D.
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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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New post 26 Nov 2014, 06:19
Bunuel wrote:

Tough and Tricky questions: Number Properties.



If p, q, r are a series of three consecutive positive integers, is the sum of all the integers odd?

(1) Two of the three numbers p, q, r are odd numbers.
(2) (p + q + r)/3 is an even integer.

Kudos for a correct solution.

Source: Chili Hot GMAT


Yes, the correct answer is D.
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Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: If p, q, r are a series of three consecutive positive integers, is the  [#permalink]

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Re: If p, q, r are a series of three consecutive positive integers, is the   [#permalink] 24 Jan 2019, 07:08
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