12 Two events A and B are if the fact that A occurs does not affect the probabil

Question

12 Two events A and B are if the fact that A occurs does not affect the probability of B occurring. 13. There are 3 blue balls, 4 red balls, and 2 white balls in a bag of balls. If a person selects two of the balls, what is the probability that the second one is blue given that the first one was white? 0 14. There are possible ways that eight pictures can be hung along a wal. 15. A business has seven locations to choose from and wishes to rank only the top three locations. How many different ways can this be done? L6 is equal to 35

Explanation / Answer

12. Independent

13. When first one is white, of the total 8 balls remaining, 3 are blue.

P(blue, given that first one was white0 = 3/8

14. 8 pictures can be hung in 8! ways.

8! = 40320

15. Number of ways in which top 3 can be ranked from 7 = 7P3

= 7! / (7-3)!

= 210

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