किस विकल्प में \(A=\{1,2\}\) के हर तत्व का ठीक एक प्रतिबिंब है?
In which option does every element of \(A=\{1,2\}\) have exactly one image?
Explanation opens after your attempt
Correct Answer
A. ({(1,a),(2,b)})
Concept
In the first option, both (1) and (2) appear once as first components. Therefore it is a function.
Why this answer is correct
The correct answer is A. ({(1,a),(2,b)}). In the first option, both (1) and (2) appear once as first components. Therefore it is a function.
Exam Tip
पहले विकल्प में (1) और (2) दोनों एक-एक बार प्रथम अवयव हैं। इसलिए यह फलन है।
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