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Xenogyst
Figuring out simple arrangements?
I've been studying questions related to permutations and combinations, and this type of question always comes up without much explanation from my books/teachers.
For example, let's say you have 7 letters total, 5 of those Xs and 2 of those Os. (XXXXXOO)
How many unique arrangements (7 long) can you make with the letters?
But the question I really have is, how would you solve this mathematically if you changed all the amounts? That is, what is the trick to solving this sort of problem?
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