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Mathematics 9 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

9! = 362,880?

OpenStudy (ash2326):

Social Security no. ________ We have 9 places to fill, there are 10 digits 0-9 So each place can be filled in 10 ways As repetition of digits is allowed so \[10*10*10*10*10*10*10*10*10=10^9\ ways\]

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