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In the triple arrangement of letters below, a triple has a value of 1 if exactly 2 of the letters in the triple are the same. Any other combination has a value of 0. The value of the entire arrangement is the sum of the values of each of the triples. What is the value of the below arrangement? ABA BBB CBA BBA ACC CBC CCC ACA BAC ABC BCA CAB CBB BCA AAB ACC
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You just want to count how many of those arrangements (the three letter combinations) have 2 of the letters the same. That would be the value of the entire arrangement.
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