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October 4th, 2019, 10:46 AM  #1 
Newbie Joined: Oct 2019 From: Hyderabad Posts: 1 Thanks: 0 
Find probability of choosing 2 black balls from 4 identical black balls and 7 identical red balls.
Last edited by skipjack; October 4th, 2019 at 02:28 PM. 
October 4th, 2019, 03:59 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733 
$\frac{4}{11}\frac{3}{10}$.

October 5th, 2019, 04:30 AM  #3 
Senior Member Joined: Mar 2015 From: Universe 2.71828i3.14159 Posts: 132 Thanks: 49 Math Focus: Area of Circle  
October 5th, 2019, 02:06 PM  #4 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733  
October 5th, 2019, 02:11 PM  #5 
Senior Member Joined: Mar 2015 From: Universe 2.71828i3.14159 Posts: 132 Thanks: 49 Math Focus: Area of Circle  

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