Question 1203686
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The presentation of part B is awkward at best; it appears to be asking the number of possible arrangements of the switch settings there are if there are three each in positions a, b, and c.<br>
The answer is then the number of distinct arrangements of the letters aaabbbccc; by a well-known counting principle, that number of arrangements is<br>
{{{(9!)/((3!)(3!)(3!))=362880/216=1680}}}<br>
ANSWER: 1680<br>