Quick! Before the girls come in!

Probability Level 2

While Sage was swimming, Ron steals his clothes and hides them in the Girls' Changing room! Ron puts it in one of 9 lockers, each locker is secured with a lock that requires a 3-digit password.

What is the maximum number of tries required for Sage to find his clothes?

Image credit: Harry Potter and the Deathly Hallows Part 2, Warner Bros
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