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Selecting Posters A buyer decides to stock 8 different posters. How many ways can she select these 8 if there are 20 from which to choose?

125,970

Intro Stats / AP Statistics

Chapter 4

Probability and Counting Rules

Section 4

Counting Rules

Sampling and Data

Probability Topics

Temple University

Cairn University

Idaho State University

Boston College

Lectures

0:00

01:39

A book club offers a choic…

01:30

Solve by the method of you…

01:03

In how many ways can 5 new…

01:08

Use any or all of the meth…

00:57

How many ways are there to…

01:26

In how many ways can 3 dif…

00:21

How many different ways ar…

02:14

In how many ways can 4 can…

00:44

Zita has packages to pick …

03:28

Selecting a Location An ad…

02:23

In an examination paper, a…

00:13

Eight people would like to…

00:33

These problems involve com…

02:08

DVD Selection How many way…

03:43

02:37

Selecting Officers In a bo…

00:54

A mathematics exam consist…

00:12

55–75 Solve the problem us…

00:41

How many different deluxe …

in this problem above wants to buy eight posters from 20 posters on. He wants to keep those eight posters with him. We conducted as able straight man like 20 See eight. This just looks like N c. R. That is number off combinations. We can make it from those. Statement and c are equal in factorial Do it and by and minus r factorial in tow. R factorial. Now we will substitute the values off and on are in a bow. Expression in factory is trendy Factorial, derided by and minus spot is when d minus eight factories into eight factorial 20 factorial. We can write it as 20 in tow 19 into 18 into 17 into 16 into 15 into 14 into 13 into 12. Fact total in denominator 20 minus eight is 12 factorial into eight Factorial. Now you will can self olfactory in numerator and denominator 20 into 19 into 18 into 17. The 16 into 15 in 14 and do 13 directed by eight Factorial that is 18 to seven into six in tow. Fire into four in tow, three into two into one. When we simplify about numerator and denominator, we will get want to fight 97 genital so a buyer can select one to find 97 Jiro vase off posters

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