This question is about using Principle of Inclusion-Exclusion
Formula, and has to be used to solve...
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This question is about using Principle of Inclusion-ExclusionFormula, and has to be used to solve this problem:
How many arrangements of a, a, a, b, b, b, c, c, c haveno adjacent letters the same? (Hint: This is tricky—not a normalinclusion–exclusion problem.)
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