gmat prep

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gmat prep

by luiscarlos59 » Tue Mar 22, 2011 8:30 pm
Didnt find it on the search.

If x is an integer and 2<k<8, what is the value of k?

1)k is a factor of 30
2)k is a factor of 12


OA E


My question is in stmnt 2 12 can be factorized in 2*2*3 so that means that 3 is the only value between 2 and 8 so that would be suff?
Source: — Data Sufficiency |

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by Night reader » Tue Mar 22, 2011 8:52 pm
x {x is integer}, 2<k<8. Find k-?

st(1) k could be 1,2,3,5,6,10,15,30 OR (2^1)*(3^1)*(5^1)--> (1+1)(1+1)(1+1)=8 factors. Given 2<k<8 we deduce k must be only {3,5,6} Not Sufficient as three values satisfy k;

st(2) k could be 1,2,3,4,6,12 OR (2^2)*(3^1)--> (2+1)(1+1)=6 factors. Given 2<k<8 we deduce k must be only {3,4,6} Not Sufficient as three values satisfy k;

Combined st(1&2): k is factor of 30 and 12 means k could be {2,3,6} and with the condition given 2<k<8 we deduce k must be only {3,6} Still Not Sufficient, as two values satisfy k;


IOM E

However, in the problem above I made assumption of x being k, as no other information about x was given - let k be integer.
luiscarlos59 wrote:Didnt find it on the search.

If x is an integer and 2<k<8, what is the value of k?

1)k is a factor of 30
2)k is a factor of 12


OA E
Although prime factorization brings 2*2*3 for 12, number 12 has 6 factors (sorry). Therefore, three possible factors satisfy to both conditions a) factor of 12 and b) 2<k<8; the factor numbers are 3, 4, and 6
luiscarlos59 wrote: My question is in stmnt 2 12 can be factorized in 2*2*3 so that means that 3 is the only value between 2 and 8 so that would be suff?
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