This question is about using Principle of Inclusion-Exclusion Formula, and has to be used to solve...

This question is about using Principle of Inclusion-Exclusion Formula, and has to be used to solve this problem:

How many arrangements of a, a, a, b, b, b, c, c, c have no adjacent letters the same? (Hint: This is tricky—not a normal inclusion–exclusion problem.)

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Colby Messinger answered 1 year ago

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