Вопрос школьника по предмету Алгебра
сколькими способами можно рассадить 2 человека на 5 стульев.
Ответ учителя по предмету Алгебра
Ответ:
10
Объяснение:
Для первого есть выбор из пяти стульев. Для второго — те же пять, без стула, на котором уже сидит первый человек. Так как мы могли выбрать каждый из способов 2 раза (сначала 1, потом 2 и наоборот), то их произведение (20) нужно поделить на 2.
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