(A) f(x)=1/x on R−{0} is bijective, IV.
(B) f(x)=x2 on N is injective but not surjective (e.g., 2 has no preimage), III.
(C) f(x)=x2 on R is neither (since f(1)=f(−1) and negatives missed), I.
(D) {(1,1),(2,2),(3,1)}: surjective, not injective, II.
The digit in the unit's place of 1337 is :
Held on 22 May 2023 · Verified 13 Jul 2026.
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