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    Probability : Counting Principle

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    A social security number has 9 digits. How many different S.S numbers are possible if:

    a. repetition of digits is permitted
    b. repetition of digits is not permitted
    c. the first digit cannot be a 0 and repetition is not permitted

    I need the layout (counting principle)
    ex. 9 8 7 - 6 5 - 2 1 4 3
    - - - - - - - - -
    Thankyou

    I think the answer for a= 1,000,000,000
    for b= 3,628, 800 and for c= 3,265,920
    Let me know!

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    https://brainmass.com/math/probability/probability-counting-principle-10168

    Solution Preview

    It's a counting problem. Follow the condition carefully and you won't miss it.

    Please see the attached file for the complete solution.
    Thanks for using BrainMass.

    A social security number has 9 digits. How many different S.S numbers are possible if:

    a. repetition of digits is permitted
    b. repetition of digits is not permitted
    c. the first digit cannot be a 0 and repetition is not permitted

    I need the layout(counting principle)
    ex. 9 8 7 - 6 5 - 2 1 4 3
    - - - - - - - - -
    Thankyou

    I think the answer for a= 1,000,000,000
    for b= 3,628, 800 and for c= ...

    Solution Summary

    Counting problems are solved and explained.

    $2.49

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