Linking combination and permutation with repetition

Combinatorial problems are difficult because it’s hard to  know which formula to use in a particular problem and when you need to ‘tweak’ or totally abandon the formula. In this post

What makes counting problems difficult

I don’t have the numbers but I think not many will disagree with me that among those who like mathematics and find joy in the challenge of solving math problems,

Pascal’s triangle and Counting Permutations

This is the second in my series of posts in combinatorics. The first post links the Fundamental  Counting Principle, Powers of 2, and the Pascal Triangle. This second post connects the

The Counting Principle, Pascal’s Triangle, and Powers of 2

This post shows how we can help students make connections among counting principle, the Pascal’s triangle, and powers of 2. I have tried this lesson in an in-service training program