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If (A={1,2,3,4}) and (f:A\to\mathbb{N}) is defined by the remainder of (x \pmod{2}), what is (f)?

Answer and explanation

Correct answer: Not one-one

Step 1: Check remainders for even and odd numbers. Step 2: (f(1)=1) and (f(3)=1), while (1\neq 3). Step 3: Remainder-based functions often send many inputs to the same value, so test one-one nature carefully.

Related tags

Modulo-FunctionNot-One-OneFinite-SetOne One FunctionRelations And FunctionsMathematicsClass 12 Mcq

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