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13.4: Кардинальність
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\(\begin{array}{ll} \text{21 were taking a SS course} & \text{26 were taking a HM course} \\ \text{19 were taking a NS course} & \text{9 were taking SS and HM} \\ \text{7 were taking SS and NS} & \tex... $\begin{array}{ll} \text{21 were taking a SS course} & \text{26 were taking a HM course} \\ \text{19 were taking a NS course} & \text{9 were taking SS and HM} \\ \text{7 were taking SS and NS} & \text{10 were taking HM and NS} \\ \text{3 were taking all three} & \text{7 were taking none} \end{array}$ Сюди входять студенти з регіонів, $a, b, d,$ і $e .$ оскільки ми знаємо кількість студентів у всіх, крім регіону, $a,$ ми можемо визначити, що $21-6-4-3=8$ студенти знаходяться в регіоні. $a$