Explain the difference between arrangements called permutati

Explain the difference between arrangements called permutations and arrangements called combinations. What is similar about these two groupings?

Solution

The difference between these two is that in permutations, order matters, while in combinations, it doesnt.

For example, in permutations, 123 and 321 are different. But in combinations, that\'s just the same.

***************

Similarity:

When we talk about nCr and nPr, we talk about n distinct items, and we get r items, BOTH WITHOUT REPLACEMENT. That\'s the similarity.