AMC 8 Daily Practice Round 9

The total number of ways to choose any shoes from shoes is:  

The number of ways to select shoes without forming any complete pair is:

- Choose different pairs out of the available:    

- For each selected pair, choose one shoe ( choices per pair):    

- Total ways to pick shoes without forming a pair:    

Thus, the number of ways to select shoes with at least one matching pair is:  

The answer is .