यदि \(f:{1,2,3,4}\to{1,2,3,4}\) को (f(x)=x-2-4x+5) से दिया जाए तो सही कथन कौन सा है?
If \(f:{1,2,3,4}\to{1,2,3,4}\) is given by (f(x)=x-2-4x+5), which statement is correct?
Explanation opens after your attempt
C. यह फलन नहीं है क्योंकि \(f(4)=5\notin{1,2,3,4}\)It is not a function because \(f(4)=5\notin{1,2,3,4}\)
Concept
Here (f(4)=16-16+5=5), which is not in the codomain. For a finite domain, checking all values is necessary.
Why this answer is correct
The correct answer is C. यह फलन नहीं है क्योंकि \(f(4)=5\notin{1,2,3,4}\) / It is not a function because \(f(4)=5\notin{1,2,3,4}\). Here (f(4)=16-16+5=5), which is not in the codomain. For a finite domain, checking all values is necessary.
Exam Tip
(f(4)=16-16+5=5) है जो सहप्रांत में नहीं है। सीमित प्रांत में सभी मान जांचना जरूरी है।
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