Difference between revisions of "2020 Mock Combo AMC 10 II Problems/Problem 7"
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Latest revision as of 12:27, 18 February 2021
To begin, since we know that aa, bb, cc are indistinguishable, then we can just use complementary counting.
Since they are indistinguishable, then one of the way to arrange them so that no two adjacent letters are identical would be ABCABC, which there are 3!*3!
