WeeG

02-15-2010, 09:21 AM

There are 9 people in group A, 4 people in group B and 2 people in group C.

6 of them will win a ticket.

1. what is the probability that all the people from group B will win a ticket ?

2. what is the probability that all the people who won a ticket come from the same group ?

I want to verify my answers...

1. (4C4 * 11C2) / 15C6

2. (9C6 * 4C0 * 2C0 ) / 15C6

where aCb is the binomial coefficient ( a on b ).

thanks !

6 of them will win a ticket.

1. what is the probability that all the people from group B will win a ticket ?

2. what is the probability that all the people who won a ticket come from the same group ?

I want to verify my answers...

1. (4C4 * 11C2) / 15C6

2. (9C6 * 4C0 * 2C0 ) / 15C6

where aCb is the binomial coefficient ( a on b ).

thanks !