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Endangered Amphibians There are 9 endangered amphibian species in the United States. How many ways can a student select 3 of these species to write a report about them? The order of selection is important.

504

02:28

Sarah F.

Intro Stats / AP Statistics

Chapter 4

Probability and Counting Rules

Section 4

Counting Rules

Sampling and Data

Probability Topics

Missouri State University

University of North Carolina at Chapel Hill

University of St. Thomas

Boston College

Lectures

0:00

03:01

California's endanger…

01:08

Selecting a committee In h…

06:53

Selecting Players How many…

02:23

In an examination paper, a…

03:52

Selecting Council Members …

01:00

Tell whether each situatio…

00:45

Class Executive In how man…

01:59

Textbook Selection How man…

01:10

Work Assignments From a gr…

00:55

Solve each problem. See Ex…

00:46

Solve the problem using th…

00:34

A school is in need of thr…

05:37

Endangered Species The cha…

00:51

A business school offers c…

00:21

The local school board is …

01:16

02:04

In how many ways can a com…

00:39

Determine the percent that…

01:22

These problems involve com…

00:47

These problems involve per…

in this problem, a student more still select three endangered amphibian species off, off nine and danger amphibian species. Now we will write the expression v foot able statement that is nine. Be three. He'll selection off. Order is very important. So we will take the number of permutations. Formula that is and B are equal toe in fact, a real buy in minus artifact Doria and equal to nine and are equal to three Now we will substitute the values off and are able formally So n p. R is nine be are equals in factory is now in factorial divided by and minus R factorial is nine minus three Effect Doria. Now we will write nine factorial in nine in tow, eight in tow, seven in tow six factory divided by nine Ministry factorial is six factorial. You will cancel six. Factory in numerator and denominator will get 504 So ah student can select 504 with in selection off amphibian species

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