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How many possible social security numbers are there

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Reference no: EM131028333

1. A social security number has 9 digits. If numbers can be repeated and all numbers can be used, there would be 10^9 possible social security numbers. Find each of the following.

a. How many possible social security numbers are there if numbers can be repeated but 0 cannot be used for the first digit?

Reference no: EM131028333

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