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GMATPrep Integers

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by Hate Standardized Tests » Thu Nov 13, 2008 11:01 am
You'd think that integers is the easiest math topic, but I'm absolutely stumped as to why the correct answer is right. Maybe I'm interpreting the question wrong?

Is the integer x divisible by 6?
(1) x + 3 is divisible by 3
(2) x + 3 is an odd number.

Answer choices:
(a) Statement 1 alone is sufficient, but Statement 2 alone is not sufficient.
(b) Statement 2 alone is sufficient, but Statement 1 alone is not sufficient.
(c) Either statements are NOT sufficient, but BOTH together are sufficient.
(d) Each statement ALONE is sufficient.
(e) Neither statement Alone is sufficient.


Any one have any insights?[spoiler] Correct Answer: c [/spoiler]
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Source: — Data Sufficiency |
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by Tryingmybest » Thu Nov 13, 2008 11:55 am
Statement 1
X+3 is divisible by 3
=> 3(X+3) + 0 where 0 is remainder

This is not sufficient
Statement 2:

X+3 is odd => 2K+1 format

Not enuf

Combine both
3(2K+1+3) +0
6k+12
which is divisible by 6 as 12/6 leaves raminder 0
So choice C :D
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by stop@800 » Thu Nov 13, 2008 8:43 pm
A
x + 3 is divisible by 3

x = 3 6
one would be divisible by 6 and another not so Insuff


B
x + 3 is an odd number
so x is even

2 4 6....
Insuff


A+B
x = 6 12 18
Suff
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by aim-wsc » Fri Nov 14, 2008 10:47 am
I think it's a double post by mistake...
continue here: https://www.beatthegmat.com/gmatprep-int ... 22742.html
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