Предмет: Математика, автор: yuliyabasalai

сколько существует девятизначных телефонных номеров в которых цифры не повторяются

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Автор ответа: xxxeol

0

Если считать, что цифр в номере 7, то всего будет вариантов 9^7= 4 782 969

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