Using the digits 2 through 9 find the number of different 3 digit numbers such that a Digits can be used more than once b Digits

Question

Using the digits 2 through 9 find the number of different 3 digit numbers such that a Digits can be used more than once b Digits cannot be repeated but can come in any order c Digits cannot be repeated and must be written in increasing order

Kunduz · Accepted Answer

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