12.7, Conditional Probability

This is probability based on knowing something about the outcome.

P(E₂|E₁) = n(E₁ and E₂)/N(E₁)

Draw Venn Diagram.

Do problems Page 787: 5, 7, 16, 20, 22, 26, 43,

12.8 Permutations

n! = n(n-1)(n-2)...(3)(2)(1), 0!=1
A permutation is an ordered arrangement of a set of objects.
_nP_r = n!/(n-r)!
For duplicate objects, the number of permutations = n!/n₁!n₂!...n_{k_!}
Page 799 9-20 do some, 21, 22, 27, 33, 36.
Do problem 53