"APPLE": 5 letters, 2 P's. Count = 5!/2! = 120/2 = 60.
"BANANA": 6 letters, 3 A's, 2 N's. Count = 6!/(3! × 2!) = 720/12 = 60.
"AAA": 3 letters, all A. Count = 3!/3! = 1. Only one arrangement.
Anagram counting is a direct application of multiset permutations.