A bookstore manager wants to display 4 identical fantasy novels, 5 Identical scl-fi novels, and 5 identical mystery novels on a shelf. How many different arrangements can be made? a. For this example, what formula will we need to use? n! O Combination: C, %3D - r)!•r! n! O Perumtation Rule #2: ... n! O Permutation: „P, %3D (n-r)! O Fundamental Counting Rule: k · k ks . kn b. Please explain how we know we are supposed to use that formula. O We are picking from multiple groups (or categories) and within each group have different choices. OWe are picking from one group multiple times and order matters. OWe are picking from one group multiple times and order does not matter. O We are rearranging all the items that come from multiple groups (or categories) and within each group there are identical items (repeats). c. How many different arrangements can be made on the shelf? (Do work on a separate piece of paper) There are different ways to arrange the books on the shelf.

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**Bookstore Arrangement Problem**

A bookstore manager wants to display 4 identical fantasy novels, 5 identical sci-fi novels, and 5 identical mystery novels on a shelf. How many different arrangements can be made?

### a. Formula Selection

For this example, which formula will we need to use?

- **Combination:** 
  \[
  C_{r}^{n} = \frac{n!}{(n - r)! \cdot r!}
  \]

- **Permutation Rule #2:** 
  \[
  \frac{n!}{n_{1}! \cdot n_{2}! \cdot \ldots \cdot n_{p}!}
  \]

- **Permutation:** 
  \[
  P_{r}^{n} = \frac{n!}{(n - r)!}
  \]

- **Fundamental Counting Rule:** 
  \[
  k_{1} \cdot k_{2} \cdot k_{3} \cdot \ldots \cdot k_{n}
  \]

### b. Explanation for Formula Selection

Why do we use this particular formula?

- We are rearranging all the items that come from multiple groups (or categories), and within each group, there are identical items (repeats).

### c. Calculation of Arrangements

How many different arrangements can be made on the shelf? (Do the work on a separate piece of paper.)

There are **_____** different ways to arrange the books on the shelf.

**Note:** Recall that the permutation formula accounts for the total number of arrangements considering repeated items. 

For further assistance or clarification, please contact your instructor.
Transcribed Image Text:**Bookstore Arrangement Problem** A bookstore manager wants to display 4 identical fantasy novels, 5 identical sci-fi novels, and 5 identical mystery novels on a shelf. How many different arrangements can be made? ### a. Formula Selection For this example, which formula will we need to use? - **Combination:** \[ C_{r}^{n} = \frac{n!}{(n - r)! \cdot r!} \] - **Permutation Rule #2:** \[ \frac{n!}{n_{1}! \cdot n_{2}! \cdot \ldots \cdot n_{p}!} \] - **Permutation:** \[ P_{r}^{n} = \frac{n!}{(n - r)!} \] - **Fundamental Counting Rule:** \[ k_{1} \cdot k_{2} \cdot k_{3} \cdot \ldots \cdot k_{n} \] ### b. Explanation for Formula Selection Why do we use this particular formula? - We are rearranging all the items that come from multiple groups (or categories), and within each group, there are identical items (repeats). ### c. Calculation of Arrangements How many different arrangements can be made on the shelf? (Do the work on a separate piece of paper.) There are **_____** different ways to arrange the books on the shelf. **Note:** Recall that the permutation formula accounts for the total number of arrangements considering repeated items. For further assistance or clarification, please contact your instructor.
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