On the day before midterm break, 20 of the 32 students enrolled in a psychology course decide to skip class, Asked in how many ways can this be accomplished if Tim and Nicole refuse to skip together, student X and Y come up with apparently different answers.
X argues this way. There are
Y says that there are
Who is right?
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Discrete Mathematics with Graph Theory (Classic Version) (3rd Edition) (Pearson Modern Classics for Advanced Mathematics Series)
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