A certain jar contains only b black, w white and r red : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 03:27

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A certain jar contains only b black, w white and r red

Author Message
Manager
Joined: 20 Sep 2007
Posts: 106
Followers: 1

Kudos [?]: 69 [0], given: 0

A certain jar contains only b black, w white and r red [#permalink]

### Show Tags

19 Jun 2008, 21:21
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A certain jar contains only b black, w white and r red marbles. If one marble is chosen at random from the jar , is the probability that the marble chosen will be red greater than the probability that the marble chosen will be white.

1 r/ ( b+w) > w/(b+r)

2 b-w > r

OA to follow
Manager
Joined: 24 Apr 2008
Posts: 162
Followers: 1

Kudos [?]: 43 [2] , given: 0

Re: marbles in a jar probability from Gmat prep [#permalink]

### Show Tags

19 Jun 2008, 22:28
2
KUDOS
Ans: A

Target: r/(r+w+b) > w/(r+w+b) if and only if r>w

St1: r/ w+b > w/ b+r -----> w+b /r < b+r / w ---> add 1 on both sides we get

w+b+r / r < b+r+w / w ---> P(r)> P(w) -----suffic

St2: b-w>r ----- Insuffi
Re: marbles in a jar probability from Gmat prep   [#permalink] 19 Jun 2008, 22:28
Display posts from previous: Sort by
{"found_math": false, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0}