Consider the function that assigns each positive integer to its FIRST (leading) digit. (For example, the positive integer 517 gets assigned to 5).  In Blank 1: What is the domain of this function?  In Blank 2: What is the range of this function? (note I am not asking for the co-domain here) Please use either the roster method or set-builder notation for your response. In Blank 3: Is this function injective? (yes or no)

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