Предмет: Математика, автор: Kataze

ПОЖАЛУЙСТА, ОЧЕНЬ СРОЧНО НУЖНО. ЕСЛИ НЕ РЕШУ,ТО НА ВТОРОЙ ГОД ОСТАВЯТ!!

Каждый из 30 учеников умный или красивый. Красивых учеников всего 26, умных — 24, а 14 учеников — ростом выше 180 см. а) Про скольких учеников гарантированно можно утверждать, что они и умные, и красивые, и выше 180 см? б) Каков ответ в пункте а), если известно, что все умные, но не красивые — ростом ниже 180 см? в) Каков ответ в пункте а), если известно, что все красивые, но не умные — ростом выше 180 см? г) Каков ответ в пункте а), если известно, что 12 умных — ростом выше 180 см?

Ответы

Автор ответа: Zluka98

а)

Ростом выше 180 всего 14 учеников

значит искомых не больше 14,

есть 4 ученика не красивых и 6 не умных

Значит заведомо умных, красивых и высоких = 14-6-4=4

Ответ:4

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