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A sequence X is define as numbers smaller than 10 that are divisible by 2 and a natural number. What are the domain and ranges?

I assume that the domain and range here is:

dom X = <1,2,3,4,5,6,7,8,9> ran X = <2,4,6,8> 

I'm not sure if this is correct, can anyone verify? Especially the dom X part, i'm not sure about that.

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