SOLUTION: find the total number of selection of at least one red ball from a bag containing 4 red balls and 5 black balls; balls of the same colour being identical?

Question 894693: find the total number of selection of at least one red ball from a bag containing 4 red balls and 5 black balls; balls of the same colour being identical?
Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!

For our selection of balls:

we can choose either 1, 2, 3, or 4 red balls.  That's 4 choices.

To go with them, we can choose either 0, 1, 2, 3, 4, or 5
black balls. That's 6 choices.

Answer: 4x6 = 24 choices which contain at least one red ball. 

Edwin

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