यदि \(f:A\to B\) और \(g:B\to C\) दोनों एकैकी हैं, तो \(g\circ f\) के बारे में सही कथन चुनिए।
If \(f:A\to B\) and \(g:B\to C\) are both one-one, choose the correct statement about \(g\circ f\).
Explanation opens after your attempt
A. सदैव एकैकीAlways one-one
Concept
Assume (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)).
Why this answer is correct
From (g(f\(a_1\))=g(f\(a_2\))), we get (f\(a_1\)=f\(a_2\)) because (g) is one-one. Then \(a_1=a_2\) because (f) is one-one.
Exam Tip
The composition of two one-one functions is one-one. चरण 1: (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)) मानें। चरण 2: (g(f\(a_1\))=g(f\(a_2\))) से (f\(a_1\)=f\(a_2\)), क्योंकि (g) एकैकी है। फिर \(a_1=a_2\), क्योंकि (f) एकैकी है। चरण 3: दो एकैकी फलनों का संयोजन एकैकी होता है।
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