# math

posted by .

How many ways can a person select four books, two CDs, and one DVD from ten books, twenty CDs, and five DVDs?

• math -

To handle this type of question, my must be familiar with the C(n,r) notation.
The person can select the books in C(10,4) or 210 ways
the CD's in C(20,2) or 190 ways
and the DVD's in C(5,1) or 5 ways.

So the number of ways to make the selection is
210*190*5 ways or 199500 ways.

## Similar Questions

1. ### Math

Write and equation to match the problem situation below. Callie has 4 rimes as many CDs as she has DVDs. She has a total of 60 CDs and DVD. How many dvds, d, does callie have?
2. ### Algebra

Word Problems (Addition/Elimination Method). Check if my answers are correct. 1.A girl bought 2 CDs and 3 DVDs for \$92. Each DVD costs \$4 more than the CDs. What is the price of each CD and DVD?
3. ### math

find the permutations one person select 4 books, 2 cds, 1 dvd from 10 books, 20 cds, and 5 dvd
4. ### Algebra

Natalie earns \$2.50 for each CD she sells and \$3.50 for each DVD she sells. Natalie sold 45 DVDs last year. She earned a total of \$780 last year selling CDs and DVDs. Write an equation that can be used to determine the number of CDs …
5. ### Algebra

Natalie earns \$2.50 for each CD she sells and \$3.50 for each DVD she sells. Natalie sold 45 DVDs last year. She earned a total of \$780 last year selling CDs and DVDs. Write an equation that can be used to determine the number of CDs …

When the sale ended, there were 10 hardcover books, 26 paperback books and 6 CDs that didn't sell. The students decided to donate them to 3 area children hospital. If the items were divided equally, how many books and CDs will each …