Each of the students was in the theater exactly twice, having watched performances $A$, $B$ or $C$. At the same time, performances $A$, $B$, $C$ were seen by $25$, $12$ and $23$ students, respectively. How many students are there in the class? need to solve using the Euler-Venn diagrams
2026-04-04 09:41:49.1775295709
Calculate:How many students?
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Number of students in the class is just $(25+12+23)/2 = 30$, each student having watched $2$ performances so we divide by $2.$