Search found 13 matches
the question asks which of the following COULD be the number of factors of K so the answer should be E as ri2007 explain and i agree with this explanation. If it asked which of the following MUST be the number of factors of K then the answer would be A because if N=1 then the number of factors K is ...
- by swle24
Sat Dec 01, 2007 4:22 am- Forum: Problem Solving
- Topic: Math PS
- Replies: 5
- Views: 1740
1.x=3*k where k is an integer. if x=3 then x-1=2 and x-1 is a factor of 104. if x=6 then x-1=5 and x-1 not a factor of 104. thus insufficient. 2. 27=x*m where m an integer. so x=27/m and since x is an integer positive, then x=1 or x=3 or x=9 or x=27. if x=1 then x-1 is not a factor of 104 but for th...
- by swle24
Sun Nov 18, 2007 1:24 pm- Forum: Data Sufficiency
- Topic: Mgmat Ds
- Replies: 3
- Views: 1597
you dont have to pick numbers.....lets take the first one f(x)=1-x that means f(1-x)=1-(1-x) thus f(1-x)=x which is not equal to f(x). substitute and to the other equations and you will find the solution
- by swle24
Thu Nov 15, 2007 1:45 pm- Forum: Problem Solving
- Topic: gmat prep functions
- Replies: 17
- Views: 6260
- by swle24
Thu Nov 15, 2007 9:18 am- Forum: Data Sufficiency
- Topic: DS gmat prep-
- Replies: 6
- Views: 2302
1/35 is the answer. 1/5=7/35 , 2/5=14/35, 3/5=21/35, 4/5=28/35, and then convert 1/7=5/35 , 2/7=10/35 , 3/7=15/35 , 4/7=20/25 , 5/7=25/35, 6/7=30/35 so the least difference is 15/35-14/35=1/35
- by swle24
Thu Nov 15, 2007 8:50 am- Forum: Data Sufficiency
- Topic: DS gmat prep-
- Replies: 6
- Views: 2302
- by swle24
Thu Nov 15, 2007 8:41 am- Forum: Problem Solving
- Topic: GMAT prep functions
- Replies: 2
- Views: 1508
- by swle24
Thu Nov 15, 2007 8:38 am- Forum: Problem Solving
- Topic: GMAT prep homes
- Replies: 3
- Views: 1699
if y=3x+2 contains (r,s) that means s=3r+2
1. (3r+2-s)*(4r+9-s)=0 then 3r+2-s=0 or 4r+9-s=0 insuff.
2. (4r-6-s)*(3r+2-s)=0 then 4r-6-s=0 or 3r+2-s=0 insuff
but combined 1+2 we get that 3r+2-s=0 so 3r+2=s sufficient
- by swle24
Thu Nov 15, 2007 2:47 am- Forum: Data Sufficiency
- Topic: Does r,s lie on the line
- Replies: 7
- Views: 2028
2. insufficient, we dont know if x+y>0
taken together again we dont know if x+y>0 but only that x>0 and y<0
- by swle24
Wed Nov 14, 2007 9:02 am- Forum: Data Sufficiency
- Topic: Tricky x-y/x+y question
- Replies: 3
- Views: 1461
x-y/x+y>1? or x-y/x+y - x+y/x+y >0 or -2y/x+y>0?
1. x>0 insuf we dont know if x+y><0><0>0kai y<0><0 so insuf
- by swle24
Wed Nov 14, 2007 9:00 am- Forum: Data Sufficiency
- Topic: Tricky x-y/x+y question
- Replies: 3
- Views: 1461
the first part of the question is insufficient because if x=7 and there are 12 even integers between x and y then y=31 and between 7 and 31 there are 12 odd integers but if x=8 and there are 12 even between x and y then y=34 but there are 13 odd integers between them.
- by swle24
Wed Nov 14, 2007 8:50 am- Forum: Data Sufficiency
- Topic: Number of odd integers
- Replies: 7
- Views: 2061
if x=7 then y=32 and k is the number of odd integers between 7 and 32 then k=12. if x=8 and y=33 then again k=12. thus in every case k=12, the answer is b
- by swle24
Wed Nov 14, 2007 8:40 am- Forum: Data Sufficiency
- Topic: Number of odd integers
- Replies: 7
- Views: 2061
since it is an equidrateral ABC length is 2/3 of its circumference. that means 2/3 πd=24 so d=36/π where π is 3.14 hence d=11
- by swle24
Wed Nov 14, 2007 6:04 am- Forum: Problem Solving
- Topic: Find the diameter -GMATPREP
- Replies: 4
- Views: 1736