A video store is running a closeout special of 5 DVDs for $15. If the store has 42 different titles in the closeout section, how many different combinations of 5 DVDs can be purchased?
98,672,427,600 118,030,185
850,668 3003

Question

A video store is running a closeout special of 5 DVDs for $15. If the store has 42 different titles in the closeout section, how many different combinations of 5 DVDs can be purchased?
98,672,427,600		118,030,185
850,668		                3003

anonymous · Answer

= 42 C 5

anonymous · Answer

express it further?

anonymous · Answer

"the store has 42 different titles"  --> Total is 42

anonymous · Answer

"how many different combinations of 5" --> pick 5

anonymous · Answer

8

anonymous · Answer

What's the formula for Combination?

anonymous · Answer

5c5?

anonymous · Answer

How do you calculate  n C r ?

anonymous · Answer

i have no idea what n,C,r even is

anonymous · Answer

C = Combination, n = total,  r = number of pick

anonymous · Answer

so CxNxR ?

anonymous · Answer

What topic are you learning now?

anonymous · Answer

still math!

anonymous · Answer

topic such as linear, fraction,..?

anonymous · Answer

Counting and Probability

anonymous · Answer

That's why you need to learn Combination and Permutation formula!
Would you look it up the Combinatin formula in your note, pls!

anonymous · Answer

what note?

anonymous · Answer

Counting and Probability

anonymous · Answer

i have homework i dont understand and no lesson cause we weren't givin one

anonymous · Answer

n C r =  n! / r! ( n - r ) !

anonymous · Answer

you have a site and a link so i can learn it simplified?

anonymous · Answer

Plug n = 42, and r = 5 to the combination formula
Try to memorize it for your own sake!

anonymous · Answer

http://www.regentsprep.org/Regents/math/algtrig/ATS5/PCPrac.htm