khanacademy.org
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Khan Academy is a free online education platform offering video lessons, practice problems, and quizzes across math and other subjects. For permutations, it provides structured tutorials on counting methods, permutations and combinations, with guided practice and interactive exercises.
More resources on Permutations
Brilliant.org - Permutations
Free trial interactive problems (Reddit fave for practice)
Khan Academy - Permutations
Interactive free lessons on permutations
Art of Problem Solving - Combinatorics
Free wiki with permutations problems and solutions
Mathematics for Computer Science
Master permutations with this MIT course on mathematics for computer science by Leighton & van Dijk! Learn key concepts & problem-solving skills.
mathworld.wolfram.com
MathWorld is a comprehensive online math encyclopedia from Wolfram Research offering rigorous, concise articles on mathematical concepts, theorems, definitions, and formulas. It covers topics across algebra, geometry, calculus, combinatorics (including permutations), number theory, and more, with detailed explanations and examples.
Concrete Mathematics
Concrete Mathematics - A book resource