A phone number is a 7-digit that does not start with 0. Call a phone numbers that make up of exactly 2 different digits. For example, "1111112" and "8111881" are acceptable, but "1111111" and "1234567" are not. How many possible phone numbers are there that contain 2 different digits?
A phone number is a 7-digit that does not start with 0. Call a phone numbers that make up of exactly 2 different digits. For example, "1111112" and "8111881" are acceptable, but "1111111" and "1234567" are not. How many possible phone numbers are there that contain 2 different digits?
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 36SE: The number of 5-element subsets from a set containing n elements is equal to the number of 6-element...
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