Is the following correspondence a function?

Y

yha

New member
Domain: All students attending Laughlin Community College
Correspondence: Each student's Social security Number
Range: A set of social security Numbers
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i know that if 1 soda costs $1 then 2 sodas is 2$ <------this is a function but i do not understand the top question about social security numbers
so this is a function?
 
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