(adsbygoogle = window.adsbygoogle || []).push({}); How many permutations of the letters ABCDEFGH contain the string ABC?

This is an example problem in my book, and the answer is 6! = 720. Could someone please explain to me the reasoning behind this (my book does a poor job explaining)? And would this reasoning apply if the string to be found was, say, just AB?

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# Homework Help: Disc. math: permutations

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