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
Correct Answer

A. (f) एक-एकी है(f) is one-one

Step 1

Concept

Suppose (f\(a_1\)=f\(a_2\)).

Step 2

Why this answer is correct

Then (g(f\(a_1\))=g(f\(a_2\))), so (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)).

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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)?

Correct Answer: A. (f) एक-एकी है / (f) is one-one. Explanation: 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। / Step 1: Suppose (f\(a_1\)=f\(a_2\)). Step 2: Then (g(f\(a_1\))=g(f\(a_2\))), so (\(g\circ f\)\(a_1\)=\(g\circ f\)\(a_2\)). Step 3: Since \(g\circ f\) is one-one, \(a_1=a_2\), so (f) is one-one.

Which concept should I revise for this Mathematics MCQ?

Suppose (f\(a_1\)=f\(a_2\)).

What exam hint can help solve this Mathematics question?

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।