# 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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