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College Mathematics

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Counting Principles and Permutation. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted

  • College Mathematics -

    If the lead digit can be a zero
    then 10^9
    If the lead digit cannot be a zero
    then 9(10^8)

  • College Mathematics -

    If the lead digit can be a zero
    then 10^9
    If the lead digit cannot be a zero
    then 9(10^8)

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