Math-New Questions

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Social Security Numbers A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted?


Is it 9^10?? 10 numbers correct?

  • Math-New Questions -

    If you intepret the string of digits as numbers, then the numbers are between 10^8 and 10^9 -1, so the answer is:

    10^9 - 1 - (10^8 - 1) =

    10^9 - 10^8

  • Math-New Questions -

    oooooh i totally got lost on this....

  • Math-New Questions -

    We can use the rule of product:
    the first number we choose from 1 to 9,
    the 2nd, 3rd,...,9th from 0 to 9.
    So the number is
    9*10*10*...*10=9*10^8 (=10^9-10^8)

  • Math-New Questions -

    SO ITS 1000000000-100000000 = 900000000??

  • Math-New Questions -

    yes

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