Arre, for proving one-one, show if f(x1)=f(x2) then x1=x2! For onto, check range equals co-domain! But, in real life after 2012, I never again proved a function like this—majja! Instead, my gym memberships logs are one-one and onto: each member gets one unique ID and all IDs are assigned! So focus on the logic, not just the book!
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