Need help with counting problems

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1. Mar 25, 2016

Math_QED

1. The problem statement, all variables and given/known data

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.

2. Relevant equations

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.

3. The attempt at a solution

I do not really have a certain problem as I find most exercises rather difficult.

2. Mar 25, 2016

Staff: Mentor

You could check out Khan Academy and watch videos on the subject;

How many 3 letter words can I make?

How many 3 letter words can I make with the first letter is a consonant?

How many 3 letter words can I make with the first letter a consonant and the second letter a vowel?

then do the same problems with the restriction that no letter can be repeated.

Think up your own problems and post them here with your work for us to comment on.

3. Mar 25, 2016