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Manager  Joined: 06 Jan 2015
Posts: 58
When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Difficulty:   25% (medium)

Question Stats: 77% (01:30) correct 23% (01:27) wrong based on 309 sessions

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When positive integer k is divided by 6 the remainder is 3. Which of the following CANNOT be an even integer?

a. k + 1
b. k -11
c. 4k + 2
d. (k-3)/3 +2
e. k/3

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Originally posted by paisaj87 on 08 Feb 2016, 09:02.
Last edited by paisaj87 on 08 Feb 2016, 11:32, edited 2 times in total.
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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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First, because k/6 leaves a remainder of 3, we know k must be odd.
(k=6x+3 = 3(2x+1) = odd*odd = odd)

Knowing k is odd we can examine the answer choices:

a. k + 1 --> odd + 1 --> must be even
b. k -11 --> odd - odd --> must be even
c. 4k + 1 --> 4*odd + 1 = even + 1 --> must be odd
d. (k-3)/3 +2 --> (6x+3-3)/3 + 2 = 2x + 2 --> must be even
e. k/3 --> (6x+3)/3 = 2x+1 = Must be odd

It seems we have a problem with the answer choices... Both C and E CANNOT result in an even integer.

paisaj87 - are you sure that these are the correct answer choices? What is the source of the problem?
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Dave de Koos
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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Thnak you for your observation, answer choice c had a typo.

davedekoos wrote:
First, because k/6 leaves a remainder of 3, we know k must be odd.
(k=6x+3 = 3(2x+1) = odd*odd = odd)

Knowing k is odd we can examine the answer choices:

a. k + 1 --> odd + 1 --> must be even
b. k -11 --> odd - odd --> must be even
c. 4k + 1 --> 4*odd + 1 = even + 1 --> must be odd
d. (k-3)/3 +2 --> (6x+3-3)/3 + 2 = 2x + 2 --> must be even
e. k/3 --> (6x+3)/3 = 2x+1 = Must be odd

It seems we have a problem with the answer choices... Both C and E CANNOT result in an even integer.

paisaj87 - are you sure that these are the correct answer choices? What is the source of the problem?

_________________
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Manager  Joined: 06 Jan 2015
Posts: 58
Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Thnak you for your observation, answer choice c had a typo.

davedekoos wrote:
First, because k/6 leaves a remainder of 3, we know k must be odd.
(k=6x+3 = 3(2x+1) = odd*odd = odd)

Knowing k is odd we can examine the answer choices:

a. k + 1 --> odd + 1 --> must be even
b. k -11 --> odd - odd --> must be even
c. 4k + 1 --> 4*odd + 1 = even + 1 --> must be odd
d. (k-3)/3 +2 --> (6x+3-3)/3 + 2 = 2x + 2 --> must be even
e. k/3 --> (6x+3)/3 = 2x+1 = Must be odd

It seems we have a problem with the answer choices... Both C and E CANNOT result in an even integer.

paisaj87 - are you sure that these are the correct answer choices? What is the source of the problem?

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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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paisaj87 wrote:
When positive integer k is divided by 6 the remainder is 3. Which of the following CANNOT be an even integer?

a. k + 1
b. k -11
c. 4k + 2
d. (k-3)/3 +2
e. k/3

Another approach is to TEST values.

When positive integer k is divided by 6 the remainder is 3

So, k could equal 3, 9, 15, 21, etc

let's TEST k = 3

a. 3 + 1 = 4 (EVEN)
b. 3 -11 = -8 (EVEN)
c. 4(3) + 2 = 14 (EVEN)
d. (3-3)/3 +2 = 2 (EVEN)

At this point, we can already see the answer must be E.
Let's check E for "fun"
e. 3/3 = 1 (ODD)
Great!

Cheers,
Brent
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When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Is there any better approach than plugging numbers here?
I spent quite a few time after arriving to below step:

k = 6* Quotient + 3 (remainder)
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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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paisaj87 wrote:
When positive integer k is divided by 6 the remainder is 3. Which of the following CANNOT be an even integer?

a. k + 1
b. k -11
c. 4k + 2
d. (k-3)/3 +2
e. k/3

First step should be to find the value of k.

So from question we know that k = 3,9,15,21 .....

Plug k = 15 in answer choices

You will get :

A. 15+1 = 16

B. 15-11 = 4

C. 4*15+2 = 62

D. (15 - 3)/3 + 2 = 6

E. 15/3 = 5

Hence E.

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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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I feel the approach by davedekoos is nice one without plugging numbers...
(PS: while relying to your post, I mistakenly edited it .)

Is there any better approach than plugging numbers here?
I spent quite a few time after arriving to below step:

k = 6* Quotient + 3 (remainder)

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When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Is there any better approach than plugging numbers here?
I spent quite a few time after arriving to below step:

k = 6* Quotient + 3 (remainder)

once you have arrived at k=6*Q+3, you need to realize that k is odd because 6Q is even and 3 is odd, Hence even+odd=odd

Now Odd divided by Odd is ODD / Non Even Integer.

Hence straight option E
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When positive integer k is divided by 6 the remainder is 3  [#permalink]

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Is there any better approach than plugging numbers here?
I spent quite a few time after arriving to below step:

k = 6* Quotient + 3 (remainder)

Here's a different approach:

GIVEN: When positive integer k is divided by 6 the remainder is 3

So, we can say that k = 6n + 3 for some integer n

Now go to the answer choices and replace k with 6n+3....

a. k + 1 = 6n+3 + 1 = 6n + 4 = 2(3n + 2). We can see that this expression is a multiple of 2. ELIMINATE A
b. k -11 = 6n+3 - 11 = 6n - 8 = 2(3n - 4). We can see that this expression is a multiple of 2. ELIMINATE B
c. 4k + 2 = 4(6n+3) + 2 = 24n + 14 = 2(12n + 7). We can see that this expression is a multiple of 2. ELIMINATE C)
d. (k-3)/3 +2 = (6n+3 - 3)/3 + 2 = 6n/3 + 2 = 2n + 2 = 2(n + 1). We can see that this expression is a multiple of 2. ELIMINATE D
e. k/3 = (6n+3)/3 = 2n + 1. Since we know that 2n is EVEN, it must be the case that 2n+1 is ODD

Cheers,
Brent
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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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paisaj87 wrote:
When positive integer k is divided by 6 the remainder is 3. Which of the following CANNOT be an even integer?

a. k + 1
b. k -11
c. 4k + 2
d. (k-3)/3 +2
e. k/3

Possible values of k are : 3 , 9 , 15 , 21.................

a. k + 1 , if k = 3 and is divided by 6 result will be even
b. k -11 , if k = 15 and is divided by 6 result will be even
c. 4k + 2 , if k = 3 and is divided by 6 result will be even
d. (k-3)/3 +2 , if k = 3 and is divided by 6 result will be even
e. k/3, (Any value of K will be completely divisible by 3 and will not produce even Integer...

Answer must be (E)
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Re: When positive integer k is divided by 6 the remainder is 3  [#permalink]

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_________________ Re: When positive integer k is divided by 6 the remainder is 3   [#permalink] 21 Aug 2019, 06:32
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