Вопрос школьника по предмету Алгебра
Пять учебников и три справочника надо поставить на одну полку так, чтобы справочники стояли вместе .Сколькими способами это можно сделать?
Ответ учителя по предмету Алгебра
Это можно сделать 6-ю способами. 3 справочника стоят в конце слева. 3 справочника стоят слева перед последней книгой. 3 справочника стоят слева перед двумя последними книгами. 3 справочника стоят справа перед двумя последними книгами. 3 справочника стоят перед последней книгой справа. 3 справочника стоят справа в конце.
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