My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum

LinkBack Thread Tools Display Modes
April 2nd, 2009, 04:34 PM   #1
Joined: Feb 2009

Posts: 8
Thanks: 0

how calculate

8C2 ?

is a combination ;P

- one marble is randomly drawn, and then NOT REPLACED, from a jar containing two white marbles and one black marble. A second marble is drawn. what is the probability of drawing a white one and then black one ?

explain pls because idk how to explain
Espanol is offline  
April 2nd, 2009, 04:52 PM   #2
Global Moderator
Joined: May 2007

Posts: 6,680
Thanks: 658

Re: how calculate

Prob of drawing white marble first is 2/3. In that case you have one white and one black left so prob. of drawing black is 1/2. So prob. of both together is 1/3.
mathman is offline  
April 2nd, 2009, 05:01 PM   #3
Joined: Feb 2009

Posts: 8
Thanks: 0

Re: how calculate

thnks ..

8 combination 2 ?
Espanol is offline  
April 2nd, 2009, 11:03 PM   #4
Global Moderator
Joined: Dec 2006

Posts: 20,262
Thanks: 1958

Use a Google search to find out how to calculate 8C2. You are not given enough information to allow the probability question to be answered. The answer mathman gave relied on a significant unstated assumption; can you identify what that assumption was?
skipjack is offline  

  My Math Forum > High School Math Forum > Algebra


Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
How To Calculate SuperFab Complex Analysis 1 January 29th, 2014 12:20 PM
How to calculate!!!! sajjad mt Calculus 12 December 2nd, 2013 09:25 AM
Calculate x Chikis Algebra 4 June 13th, 2013 10:03 PM
To calculate the value of Z pitrpan Advanced Statistics 2 April 14th, 2011 02:09 PM
calculate 1^2+2^2+...n^2 stole Number Theory 3 August 15th, 2009 07:41 AM

Copyright © 2019 My Math Forum. All rights reserved.