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OpenStudy (anonymous):
Five light bulbs that are either on or off are lined up in a row. A certain code uses different combinations of lights turned on to represent different words. If exactly 2 lights must be turned on to represent a word, how many different words can be formed using the 5 light bulbs?
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OpenStudy (kropot72):
\[5C2=\frac{5!}{2!3!}\]
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