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when n is devided by 4, the remiander is 3. the remainder

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when n is devided by 4, the remiander is 3. the remainder [#permalink] New post 05 Oct 2007, 14:07
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A
B
C
D
E

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when n is devided by 4, the remiander is 3. the remainder when 2n is devided by 4 is

a] 1
b] 2
c] 3
d] 6
e] 4

I am sort of on the right track here, but cant quite understand the last step. Ill post the OA in a bit. Oh, post your explanations as well :-D
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 [#permalink] New post 05 Oct 2007, 14:28
n/4 = y & remiander(3)

This can be expressed as:

4*y+3 = n

and

2*n = 2*(4*y+3) = 8*y+6

Easy to test ---> assume y=2

See bluebird's post

:)

Last edited by KillerSquirrel on 05 Oct 2007, 14:54, edited 1 time in total.
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 [#permalink] New post 05 Oct 2007, 14:42
I'm getting B....

n/4 = Q+3
Therefore, n=7,11,15,19,etc.

Using these values, 2n = 14,22,30,38,etc.
each of these values divided by 4 leaves a remainder of 2

Answer: B
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Re: PS: Remainder question [#permalink] New post 05 Oct 2007, 14:43
pmenon wrote:
when n is devided by 4, the remiander is 3. the remainder when 2n is devided by 4 is

a] 1
b] 2
c] 3
d] 6
e] 4

I am sort of on the right track here, but cant quite understand the last step. Ill post the OA in a bit. Oh, post your explanations as well :-D


B,

remainder is also multiplied by 2, so 6/4=1 plus remainder 2/4.


EDITTED*

Last edited by IrinaOK on 05 Oct 2007, 16:10, edited 1 time in total.
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 [#permalink] New post 05 Oct 2007, 14:49
Bluebird wrote:
I'm getting B....

n/4 = Q+3
Therefore, n=7,11,15,19,etc.

Using these values, 2n = 14,22,30,38,etc.
each of these values divided by 4 leaves a remainder of 2

Answer: B


Yes you are correct !

the answer is (B)

:)
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Re: PS: Remainder question [#permalink] New post 05 Oct 2007, 15:02
pmenon wrote:
when n is devided by 4, the remiander is 3. the remainder when 2n is devided by 4 is

a] 1
b] 2
c] 3
d] 6
e] 4

I am sort of on the right track here, but cant quite understand the last step. Ill post the OA in a bit. Oh, post your explanations as well :-D


the best strategy to apply is picking numbers to save time;

7 fine remainder 3, ----> 14 remainder is 2
15 fine remainder 3, ----> 30 remainder is 2
19 fine remainder 3, -----> 38 remainder is 2

so B
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 [#permalink] New post 05 Oct 2007, 17:46
OA is B :)

I was approaching the question using formulas, but got stuck at this point:

n=4q+3

2n=8q+6

from here, without picking numbers, how do you figure out that the remainder is 2 ?
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 [#permalink] New post 05 Oct 2007, 23:03
pmenon wrote:
OA is B :)

I was approaching the question using formulas, but got stuck at this point:

n=4q+3

2n=8q+6

from here, without picking numbers, how do you figure out that the remainder is 2 ?


i would not even attempt it with formulaes. now try to divide the final equation by four. u will not have chance to determine it then.

better use picking numbers as u save time for other questions
  [#permalink] 05 Oct 2007, 23:03
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when n is devided by 4, the remiander is 3. the remainder

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