This math topic focuses on calculating permutations of words where some letters are repeated. Specifically, it asks students to determine the number of unique ways to order the letters of given words such as "BOBBY," "BUBBY," "MUMMY," "FOOLS," "GRASS," "APPLE," and "SASSY." Each problem presents a word with at least one repeated letter, and students must use understanding of factorials and arrangement rules for sets with duplicates to solve the questions. The topic is part of a broader unit on probability and statistics involving factorial practice.
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How many ways can these letter tiles be ordered to spell 'APPLE'?