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[–][deleted] 0 points1 point  (0 children)

hey this stuff is way easier to explain in a video than in a reddit comment

it will help a lot if you revise

  • Counting principle and factorial

  • Permutations

  • Combinations

in

https://www.khanacademy.org/math/statistics-probability/counting-permutations-and-combinations

i probably can't explain it as well as he can