The author posted a question in Homework
Help me solve a problem in higher mathematics? and got a better answer
Response from Дима[+++]
Response from 0[+++++]
We can take out BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB. It's a complete event space. Pick what fits: 1, 3, 5, 7 choices. p1=5/15*4/14*3/13 p3=5/15*10/14*4/13 p5=10/15*5/14*4/13 p7=10/15*9/14*5/13 And the required probability is p1+p3+p5+p7. Can you do the arithmetic?
We can take out BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB, BBB. It's a complete event space. Pick what fits: 1, 3, 5, 7 choices. p1=5/15*4/14*3/13 p3=5/15*10/14*4/13 p5=10/15*5/14*4/13 p7=10/15*9/14*5/13 And the required probability is p1+p3+p5+p7. Can you do the arithmetic?
Response from 0[+++++]
Mix up the three balls taken out and pass off the third ball as the first - no one will know. So P=5 10=0 5
Mix up the three balls taken out and pass off the third ball as the first - no one will know. So P=5 10=0 5