Total estudiantes 45
Toman leche 28
Toman yogurt 25
Toman leche y yogurt 12
Sólo toman leche 28-12 = 16
Sólo toman yogurt 25-12 = 13
Toman leche o yogurt 28+25-12 = 41
No toman ni leche ni yogurt 45-41 = 4
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Total estudiantes 45
Toman leche 28
Toman yogurt 25
Toman leche y yogurt 12
Sólo toman leche 28-12 = 16
Sólo toman yogurt 25-12 = 13
Toman leche o yogurt 28+25-12 = 41
No toman ni leche ni yogurt 45-41 = 4