Permutations: How many ways to rearrange the letters in a word?

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We look at an example based on reordering letters in a word. This is an example of permutations in combinatorics, where we care about the order the letters appear. We will look first at an example WITHOUT repeats, and take up the case with repeats in a later video.

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Excellent intuitive explanation. I'm actually amazed at how you explained the general equation for permutations. I never understood why we used (n-r)! until now. Thank you!

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Permutations: How many ways to rearrange the letters in a word?

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