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Let $X_i$ denote the event that there are at least $i$ students attending a tutorial.
\nConsider the following notation:
\nA. $X_1$
\nB. $\\overline{X_1}$
\nC. $X_1\\overline{X_2}$
\nD. $\\overline{X_1}X_2$
\nWhat notation can be used to describe each of the following events?
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