Search found 151 matches
x^3 * y^6 * z^9 < 0
(x * y^2 * z^3)^3 < 0
x * y^2 * z^3 < 0
x * z^3 < 0 (y^2 is non-negative)
x * z * z^2 < 0
xz <0
y could be whatever. As long as it's not zero, y^6 will be positive
- by PussInBoots
Sun Sep 06, 2009 4:02 pm- Forum: Problem Solving
- Topic: If x^3 * y^6 * z^9 < 0, which of the following must be tr
- Replies: 5
- Views: 1321
- by PussInBoots
Sat Sep 05, 2009 11:41 am- Forum: Problem Solving
- Topic: Speed and Distance
- Replies: 9
- Views: 1736
Distance: 100
Peter drove 40, Tom drove 60
Time is t, same for both
Average speeds are 40/t and 60/t
(40/t) / (60/t) = 2/3
- by PussInBoots
Wed Sep 02, 2009 10:24 am- Forum: Problem Solving
- Topic: Prep Test
- Replies: 4
- Views: 2402
(3C2*3C2 + 3C1 * 3C3) / 6C4
(2 dimes * 2 quarter + 1 dime * 3 quarters) / pick 4 coins out of 6
Answer is E
- by PussInBoots
Tue Sep 01, 2009 11:55 pm- Forum: Data Sufficiency
- Topic: probability/combinatorics
- Replies: 2
- Views: 1219
E.
Sum/difference of two odd integers is always even. (1) and (2) don't give any info.
Examples
9 and 3, 9-3 = 6, 6/2 = 3 not even
5 and 1, 5 - 1 = 4, 4/2 = 2 even.
- by PussInBoots
Tue Sep 01, 2009 11:47 pm- Forum: Data Sufficiency
- Topic: s+t is even
- Replies: 3
- Views: 1481
- by PussInBoots
Tue Sep 01, 2009 10:38 am- Forum: Data Sufficiency
- Topic: veritas prep question
- Replies: 3
- Views: 1292
- by PussInBoots
Tue Sep 01, 2009 10:24 am- Forum: Data Sufficiency
- Topic: Is M^3>=1
- Replies: 6
- Views: 1377
n = integer / integer -> n is rational, hence if n^a (a is positive integer) is integer, then n is integer also.
- by PussInBoots
Sun Aug 30, 2009 6:08 pm- Forum: Data Sufficiency
- Topic: is n an integer?
- Replies: 2
- Views: 1309
http://www.beatthegmat.com/data-sufficiency-f7.html
http://gmatclub.com/forum/gmat-data-sufficiency-ds-141/
- by PussInBoots
Sun Aug 30, 2009 10:03 am- Forum: Data Sufficiency
- Topic: help in Data Sufficiency
- Replies: 1
- Views: 1199
(1) & (2) alone insuff
(1) + (2): let's find least common multiple
25 = 5 * 5; 40 = 5 * 2 * 2 * 2
LCM = 5 * 5 * 2 * 2 * 2 = 200
if d = 200, sqrt(200) < 15
if d = 2000, sqrt(2000) > 15
E
- by PussInBoots
Sun Aug 30, 2009 9:59 am- Forum: Data Sufficiency
- Topic: DS
- Replies: 1
- Views: 1164
- by PussInBoots
Sat Aug 29, 2009 10:08 pm- Forum: Data Sufficiency
- Topic: any idea how to solve the following two questions?
- Replies: 3
- Views: 1257
- by PussInBoots
Sat Aug 29, 2009 8:19 pm- Forum: Problem Solving
- Topic: positive integer m
- Replies: 9
- Views: 1877
- by PussInBoots
Sat Aug 29, 2009 7:52 pm- Forum: Data Sufficiency
- Topic: Lots of triangles
- Replies: 6
- Views: 1510
- by PussInBoots
Sat Aug 29, 2009 7:49 pm- Forum: Data Sufficiency
- Topic: question on Dividing inequalities
- Replies: 8
- Views: 1877
Total 3-digit numbers: 9 * 10 * 10 = 900
3-digit numbers that satisfy the problem: 9 * 8 * 1 = 72
72 / 900 = 2/25
- by PussInBoots
Sat Aug 29, 2009 7:38 pm- Forum: Problem Solving
- Topic: 3 digits
- Replies: 5
- Views: 1451