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March 29, 2017

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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??

  • Math - ,

    http://www.jiskha.com/display.cgi?id=1311437782

  • Math - ,

    Ms. Sue, wouldn't it be 9^10? I think 0 wasn't included, so it would be 10 numbers not 9.....right???

  • Math - ,

    I'm not sure.

    Please post this as a New Question. That way a math tutor may be able to help you.

  • Math - ,

    For social security numbers, 0 can be included.

    n^r = 10^9, where n is the number of things to choose from, and you choose r of them (Repetition allowed, order matters)

  • Math - ,

    so it would be 1,000,000,000???

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