यदि \(g\circ f\) एक-एकी है, तो (f) के बारे में कौन-सा कथन निश्चित रूप से सही है?
If \(g\circ f\) is one-one, which statement is definitely true about (f)?
Explanation opens after your attempt
A. (f) एक-एकी है(f) is one-one
Concept
Suppose (f\(a_1\)=f\(a_2\)).
Why this answer is correct
Then (g(f\(a_1\))=g(f\(a_2\))), so (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)).
Exam Tip
Since \(g\circ f\) is one-one, \(a_1=a_2\), so (f) is one-one. चरण 1: मान लें (f\(a_1\)=f\(a_2\))। चरण 2: तब (g(f\(a_1\))=g(f\(a_2\))), यानी (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\))। चरण 3: \(g\circ f\) एक-एकी है, इसलिए \(a_1=a_2\), अतः (f) एक-एकी है।
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