3.4 counting principles i.the fundamental counting principle: if one event can occur m ways and a...

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3.4 Counting Principles I. The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the 2 events can occur in sequence is m x n. Page 150-151 Examples 1 & 2

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Page 1: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

3.4 Counting Principles

I. The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the 2 events can occur in sequence is m x n.

Page 150-151 Examples 1 & 2

Page 2: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

II. Permutations

• An ordered arrangement of objects• The number of different permutations of n

distinct objects is n!• Factorial: n! = n(n-1)(n-2)…• P152 Example 3

•nPr = n! The number of permutations of n

(n-r)! distinct objects taken r at a time

• P152-153 Examples 4 & 5

Page 3: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

• Distinguishable Permutations:

• P154 Example 6 and TIY6

Page 4: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

III. Combinations

• A selection of r objects from a group of n objects without regard to order

• nCr = n!

(n-r)!r!

• P155 Example 7 and TIY#7

Page 5: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

IV. Applications of Counting Principles1. A word consists of 1 M, 4 Is, 4 Ss, and 2

Ps. If the letters are randomly arranged in order, what is the probability the arrangement spells the word Mississippi?

Page 6: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

2. A word consists of 1 L, 2 Es, 2 Ts, and 1 R. If the letters are randomly arranged in order, what is the probability the arrangement spells the word Letter?

Page 7: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

3. Find the probability of being dealt five diamonds from a standard deck of playing cards. (In poker, this is a diamond flush.)

Page 8: 3.4 Counting Principles I.The Fundamental Counting Principle: if one event can occur m ways and a second event can occur n ways, the number of ways the

4. A jury consists of 5 men and 7 women. Three are selected at random for an interview. Find the probability that all three are men.

• P158 #24-38even