यदि \(f:{1,2,3}\to{1,2,3,4,5}\) by (f(x)=x-2), तो क्या (f) valid function है?
If \(f:{1,2,3}\to{1,2,3,4,5}\) by (f(x)=x-2), is (f) a valid function?
Correct answer and explanation
A. नहीं, क्योंकि \(f(3)=9\notin{1,2,3,4,5}\)No, because \(f(3)=9\notin{1,2,3,4,5}\)
Simple Explanation
output unique तो है, लेकिन (f(3)=9) codomain में नहीं है। function के लिए image codomain के अंदर भी होनी चाहिए। / The output is unique, but (f(3)=9) is not in the codomain. For a function, every image must also lie in the codomain.
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