The combination for opening a safe is a four-digit number made up of different digits. How many different combinations cna you make, using only odd digits?


  1. Answer:
    Step-by-step explanation:
    My choices are: 1, 3, 5, 7, 9.  I cannot repeat any of the numbers.
    The first spot, I have 5 choices.  The second spot, I have 4 choices, the third spot, I have 3 choices and the final spot has only 2 choices.
    5x4x3x2 = 60


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