5/11/2022 PA 7 Do Now - Permutations/Factorials

What does the n stand for in _nP_r?

• number of items you want to choose

• number of items to choose from

• any number

• Permutations

What does ₁₀P₅ mean?

• Permutations with 5 choices and 10 you want to choose

• Permutations with 10 choices and 5 you want to choose

• Permutations with 5 numbers and 10 operations

• Permutations with 5 hot dogs and 10 drinks

What is the value of ₁₀P₅?

• 30240

• 151200

• 720

• 3628800

Simplify this

Simplify this

At the beginning of the summer, you have 5 books to read. In how many orders can you read the books?

How many ways ways can you arrange the letters in the word math?

How many ways can you listen to 3 songs from a CD that has 12 selections?

How many ways can a club select a president, vice president, and a secretary from a group of 5 people?

• 12
• 60
• 15

A disc jockey has to choose three songs for the last few minutes of his evening show.  If there are nine songs that he feels are appropriate for that time slot, then how many ways can he choose and arrange to play three of those nine songs?

• 84
• 504
• 9!
• 3!