- #1
Vector1962
- 61
- 8
Homework Statement
[/B]
A bag has a total of 12 balls, 3 of which are black. If you select 6 balls from the bag. a) How many sets of 6 can be made? b) How many of the sets of 6 contain 3 black balls? c) What is the probability of selecting a set of 6 that contains 3 black balls?
Homework Equations
NPR
NCR
The Attempt at a Solution
[/B]
Part a) I believe 12C6 gives the total of sets of 6 = 924
Part b) I believe 9C6 gives the total of sets of 6 of white balls only so (12C6) - (9C6) = sets that have 3 black?
Part c) [ 12C6 - 9C6 ] / 12C6 ?
Last edited: