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Number properties question

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Re: Number properties question [#permalink] New post 31 Jan 2010, 16:59
Expert's post
roceeet wrote:
if x is an integer and y = 3x + 2, which of the following CANNOT be a divisor of y?

(a) 4
(b) 5
(c) 6
(d) 7
(e) 8


y is not multiple of 3, actually it's 2 more than multiple of 3. So if y is not a multiple of 3 it cannot be the multiple of 6 as well.

Answer: C.

Roceeet you post good questions to practice. The only thing I'd suggest to post them in separate threads instead.
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Re: Number properties question [#permalink] New post 31 Jan 2010, 17:23
sorry about that, thanks for the tip.
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Re: Number properties question [#permalink] New post 31 Jan 2010, 23:54
Basically we are checking: for prime numbers X and Y so that

(X+Y) /XY = one of the above answer choices...hit and trial gives the answer as (e) ..not other choice seems to be possible.
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Re: Number properties question [#permalink] New post 02 Feb 2010, 08:56
roceeet wrote:
sorry about that, thanks for the tip.



what is answer ?

y=3X+2;

then, Y must not be divible by 3; what is answer? choice C should be correct.
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Re: Number properties question [#permalink] New post 02 Feb 2010, 19:05
you are right the answer is C
Re: Number properties question   [#permalink] 02 Feb 2010, 19:05
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