Search found 13 matches
Coordinate Geometry
In the xy-coordinate plane, line I1 and line I2 intersect at the point (-2,5). Is the product of their slopes negative ?
(1) The product of the x-intercepts of lines I1 and I2 is negative.
(2) The product of the y-intercepts of lines I1 and I2 is positive.
- by koby_gen
Wed May 11, 2011 10:51 am- Forum: Data Sufficiency
- Topic: Coordinate Geometry
- Replies: 7
- Views: 1224
- by koby_gen
Wed May 11, 2011 10:46 am- Forum: Data Sufficiency
- Topic: Absolute Value
- Replies: 1
- Views: 861
Statistics
Which of the following CANNOT be the median of the four positive integers a, b, c and d where a ≤ b < c ≤ d
(A) (a+c)/2
(B) (b+c)/2
(C) (a+d)/2
(D) (b+d)/2
(e) (c+d)/2
- by koby_gen
Wed May 04, 2011 8:49 am- Forum: Data Sufficiency
- Topic: Statistics
- Replies: 2
- Views: 955
Number Properties
If p and q are integers and p*q-p*p is even, which of the following must also be even ?
(A) p
(B) q
(C) p-q
(D) pq
(E) p-pq
- by koby_gen
Wed May 04, 2011 8:43 am- Forum: Data Sufficiency
- Topic: Number Properties
- Replies: 3
- Views: 1044
(a² - b)Anurag@Gurome wrote:Is it (a² - b) or a(a - b)?koby_gen wrote:Is 2a < a x a - b ?
(1) 0 < a < 2
(2) -2 < b < 0
Thanks
- by koby_gen
Fri Feb 04, 2011 12:45 am- Forum: Data Sufficiency
- Topic: Inequalities
- Replies: 7
- Views: 2227
- by koby_gen
Thu Feb 03, 2011 11:50 pm- Forum: Data Sufficiency
- Topic: Inequalities
- Replies: 7
- Views: 2227
- by koby_gen
Thu Feb 03, 2011 8:43 am- Forum: Data Sufficiency
- Topic: Absolute Values
- Replies: 15
- Views: 3188
Number properties - exponents
Is ( 7^(X+2) ) / 49 > 1 ?
(1) 7^(x+2) > 1/49
(2) 7^(x-1) > 1/49
PS "^" means exponential
- by koby_gen
Thu Feb 03, 2011 4:04 am- Forum: Data Sufficiency
- Topic: Number properties - exponents
- Replies: 8
- Views: 1577
Number properties - prime factors
If y is an integer such that 2 < y < 100 and if y is also the square of an integer, what is the value of y ?
(1) y has exactly two prime factors.
(2) y is even.
- by koby_gen
Wed Feb 02, 2011 10:50 pm- Forum: Data Sufficiency
- Topic: Number properties - prime factors
- Replies: 27
- Views: 14329
Counting Methods
The five sides of a pentagon have lenghts of 2, 3, 4, 5 and 6 inches. Two pentagons are considered different only when the positions of the side lenghts are different relative to each others. What is the total number of different possible pentagons that could be drawn using these five side lenghts ?...
- by koby_gen
Fri Jan 21, 2011 4:44 am- Forum: Problem Solving
- Topic: Counting Methods
- Replies: 7
- Views: 2569
Geometry - parallelograms and circles
Which of the following lists the number of points at which a circle can intersect a parallelogram ?
(A) 2, 4, and 8 only
(B) 2, 4, 6 and 8 only
(C) 1, 2, 3, 4, 6 and 8 only
(D) 2, 3, 4 , 5, 6, 7 and 8 only
(E) 1, 2, 3, 4, 5, 6, 7 and 8
- by koby_gen
Fri Jan 21, 2011 1:30 am- Forum: Problem Solving
- Topic: Geometry - parallelograms and circles
- Replies: 2
- Views: 2255
Problem Solving - Numbers properties
If n=8p, where p is a prime number greater than 2, how many different positive even divisors does n have, including n ?
(A) 2
(B) 3
(C) 4
(D) 6
(E) 8
- by koby_gen
Sun Jan 09, 2011 9:34 am- Forum: Problem Solving
- Topic: Problem Solving - Numbers properties
- Replies: 33
- Views: 15495
Problem Solving - counting problems
Of the three-digit integers greater then 750, how many have at least two digits that are equal to each other ?
(A) 56
(B) 70
(C) 72
(D) 74
(E) 78
- by koby_gen
Fri Jan 07, 2011 10:19 pm- Forum: Problem Solving
- Topic: Problem Solving - counting problems
- Replies: 10
- Views: 2629