I am here to talk to you today about combinations and give you all a fair bit of information that may help you to learn about combinations.
http://en.wikipedia.org/wiki/Combination - Wikipedia Website
http://mathforum.org/dr.math/faq/faq.comb.perm.html - Math Forum Wesbite
This website has great information on both combinations AND permutations (helping out a little bit)
A combination is an un-ordered collection of elements.
The order of the elements within a combination is not important. For instance, the same elements within two lists are in different orders are still referred to as the same combination.
Also in combinations, elements are never to be repeated.
I hope this gives everyone a basic gist on what combinations are all about...