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Math Comic #36 - "Dining Possibilities" - (6-10-12)
What is the difference between a combination and permutation? Here are explanations, formulas, and examples. Plus, there are exercises (and answers).
Download Free Statistics Combinations and Permutations.pdf file
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More challenging combination and permutation problems at vitutor.com (in English and Spanish)
Statistics and counting principle tutorials and problems from analyzemath.com
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Math Comic #120 - "Factorials!" - (1-8-14)

Is this actually a combination lock?
