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Combinatorics NEW
Count arrangements, shuffle combinations, and master the art of counting! 🃏🔢🎲
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🎴PermutationsOrder matters
🧮CombinationsOrder doesn't matter
❗Factorialsn! = n×(n−1)×...×1
🔺Pascal's TrianglePatterns in numbers
🕳️Pigeonhole PrincipleGuaranteed matches
Choose your level:
Answer counting questions — permutations, combinations and more. Learn a math fact after every answer!