Notes on Counting
نویسنده
چکیده
It is important to be able to count exactly the number of elements in any finite set. We will see many applications of counting as we proceed (number of Enigma plugboard arrangements, computer passwords of a certain form, telephone area codes, automobile license plates, binary strings of a certain length needed to encode uniquely each possible English message of a certain length, etc.). In this section we list some of the basic techniques that are helpful for counting even in complicated situations.
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تاریخ انتشار 2009