Предмет: Математика, автор: vshebunjaev

Из 25 человек студенческой группы по результатам психологического теста 12 человек оказались веселого характера, 16 – замкнутыми и 8 не показали себя ни веселыми, ни замкнутыми. Сколько человек оказались одновременно веселого, но замкнутого характера? Решить задачи, используя теорию множеств

Ответы

Автор ответа: g4300563
4
Пусть первое множество состоит из 12 чел., второе из 16 и третье из 8. Вычитая из общего числа (25) студентов одновременно первое и второе множества, получаем (25) - (12) - (16) = 7 чел оказались одновременно веселого, но замкнутого характера.
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Предмет: Математика, автор: Аноним