Question

Six-digit numbers are to be formed using only the digits in the set: A = {1,...

  1. Six-digit numbers are to be formed using only the digits in the set:

A = {1, 2, 3, 4, 5, 6, 7, 8}

  1. How many such numbers can be formed if repetitions of the digits are allowed?
  2. In part (a), how many of the numbers contain at least one 3 and at least one 5?

c. How many 6-digit numbers can be formed if each digit in A can be used at most once?    

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