How many groups of two colors of balloons can you choose from 4 colors of plans

Question

is it permutation or combination? This question is really getting to me and I'm not sure how to solve it or what the answer is, please help

Answer 1

Permutation: order makes a difference, AB is not the same as BA

Combination: order does not make a difference.

 

This is a combination, blue and red is the same as red and blue.

 

4 · 3 = 12