Pre-Calculus 12 Section 11.1 Part 2

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Permutations Part 2

NOTE: Don't get confused on #5....I said identitcal textbooks of the same subject area, and not different textbooks in the same subject area. Don't get confused.
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Thanks for your videos! You`re not my teacher but your videos are extremely helpful and detailed!

jieunkim
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It's confusing in Ex 5 part a) why the numerator is 5! and not 6! but I think I get it because you're creating 2 scenarios i.e, 2 books on either end then adding them up.

gtrdoc