Search found 7 matches
Re: probability
from a bag containing 12 identical blue balls, y identical yellow balls and no other balls, one ball will be removed at random. If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag? Ans: 17, 18, 19, 20, 21 Thanks so...
- by reacher
Mon Oct 27, 2008 7:11 am- Forum: Problem Solving
- Topic: probability
- Replies: 3
- Views: 3135
RX- REVENUE OF X RY - REVENUE OF Y EX-EXPENSE OF X EY-EXPENSE OF Y To check if RX-EX > RY-EY (Revenue-expenses = profit) Stmt I) EX=5/6EY We dont know the revenue for either X or Y(cant determine the greater profit) so INSUFF Stmt II RX=RY-6 We dont know the expense for either X or Y(cant determine...
- by reacher
Mon Oct 27, 2008 5:36 am- Forum: Data Sufficiency
- Topic: GMAT PREP question w/ OA
- Replies: 8
- Views: 2529
Re: CO ordiates !
S is a set of points in the plane. How many distinct triangles can be drawn that have three of the points in S as vertices? (1) The number of distinct points in S is 5. (2) No three of the points in S are collinear. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B....
- by reacher
Sun Oct 26, 2008 6:28 am- Forum: Data Sufficiency
- Topic: CO ordiates !
- Replies: 7
- Views: 7358
Re: og ds 137
what is the value of (a^4) - (b^4)? 1. (a^2) - (b^2) = 16 2. a=b=8 qa is c however cant see to get the meaning of (a^2)+(b^2) You seem to have changed the statement 2 of the question simba. Statement 2 actually reads " a+b=8 " and with this statement one can solve only a part of the answe...
- by reacher
Sun Oct 26, 2008 5:55 am- Forum: Data Sufficiency
- Topic: og ds 137
- Replies: 3
- Views: 1670
Line in the figure calculate the slope we have two points, one on y axis (0,2) and another on x axis (-3, 0) slope m = y2-y1/x2-x1 = 2-0/0-(-3) = 2/3 equation of line in figure = y=mx+c c = y ordinate, when line passes on y axis = 2 y=2x/3 + 2 or 3y = 2x + 6 though we dont need to calculate the equ...
- by reacher
Thu Oct 02, 2008 7:00 am- Forum: Problem Solving
- Topic: Graph Problem
- Replies: 5
- Views: 1607
Can't the answer be A? 1) if n = 2 (i.e. 22+23=45) if n > 2 , but still even the answer will ALWAYS be even and never be 45 (odd) So n can only be 2. SUFF Any comments?? There is a clue in statement 2. In fact, n can also be 9 (1+2+3...9) =45. In a way, Statement 2 is expressing that n is not 9. Si...
- by reacher
Thu Oct 02, 2008 5:55 am- Forum: Data Sufficiency
- Topic: MGMAT
- Replies: 3
- Views: 1441
Can't the answer be A? 1) if n = 2 (i.e. 22+23=45) if n > 2 , but still even the answer will ALWAYS be even and never be 45 (odd) So n can only be 2. SUFF Any comments?? There is a clue in statement 2. In fact, n can also be 9 (1+2+3...9) =45. In a way, Statement 2 is expressing that n is not 9.
- by reacher
Thu Oct 02, 2008 5:50 am- Forum: Data Sufficiency
- Topic: MGMAT
- Replies: 3
- Views: 1441