Counting problems are a very tough subject to me, so if someone could give me tips, examples explaining what's really happening, that would be great.
I know what permutations, variations, combinations, ... are. The problems involving only one of those are do-able, but those that combine more than one are the difficult ones for me.
The Attempt at a Solution
I do not really have a certain problem as I find most exercises rather difficult.[/B]
Thanks in advance.