यदि \(f:A\to B\) और \(g:B\to C\) दोनों एकैकी हों तो \(g\circ f\) कैसा होगा?
If \(f:A\to B\) and \(g:B\to C\) are both one-one, what is \(g\circ f\)?
Correct answer and explanation
A. हमेशा एकैकीAlways one-one
Concept
यदि (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)) हो तो (g(f\(a_1\))=g(f\(a_2\)))। / If (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)), then (g(f\(a_1\))=g(f\(a_2\))).
Why this answer is correct
(g) एकैकी है इसलिए (f\(a_1\)=f\(a_2\)), और (f) एकैकी है इसलिए \(a_1=a_2\)। / Since (g) is one-one, (f\(a_1\)=f\(a_2\)), and since (f) is one-one, \(a_1=a_2\).
Exam Tip
दो एकैकी फलनों का समिश्र भी एकैकी होता है। / The composition of two one-one functions is one-one.
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