Respuesta :

here the digit is a security number is 9

so we have 9 places here,

a single place can contain digit 0 to 9

so total 10 digit is possible at one place,

for the 9 places, the possible numbers can be

[tex]10^9[/tex]

so the answer is 10^9

[tex]10^9\text{ different social security numbers can be formed.}[/tex]

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