SOLUTION: Gregg wants to buy 12 songs but can only afford 7. How many ways can he buy 7 songs out of 12.
Algebra.Com
Question 1057392: Gregg wants to buy 12 songs but can only afford 7. How many ways can he buy 7 songs out of 12.
Answer by ikleyn(52797) (Show Source): You can put this solution on YOUR website!
.
= .
It is the number of combinations of 12 things taken 7 at a time.
If you want to learn more about combinations in combinatorics, see the lessons
- Introduction to Combinations
- PROOF of the formula on the number of Combinations
- Problems on Combinations
in this site.
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this online textbook under the topic "Combinatorics: Combinations and permutations".
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