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Permutations Made Simple: Counting Numbers with Non-Repeating Digits
We explain how permutations work using the fundamental principle of multiplication. We start with a McDonald’s example (choosing 1 sandwich from 5 options and 1 burger from 4 options = 20 ways), then apply this concept to solve a CAT problem: counting numbers up to 500 where digits don’t repeat. We break it down into three cases—single ...
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