\(यदि (A={1,2,3,4}) और (R={(a,b):ab\) सम है}) हो तो कौन सा युग्म (R) में नहीं है?
\(If (A={1,2,3,4}) and (R={(a,b):ab\) is even}), which pair is not in (R)?
Explanation opens after your attempt
Correct Answer
D. \((1,3)\)
Concept
Since \(1\cdot 3=3\) is odd, \((1,3)\notin R\). A product is even when at least one component is even.
Why this answer is correct
The correct answer is D. \((1,3)\). Since \(1\cdot 3=3\) is odd, \((1,3)\notin R\). A product is even when at least one component is even.
Exam Tip
\(1\cdot 3=3\) विषम है इसलिए \((1,3)\notin R\) है। गुणनफल सम तभी होगा जब कम से कम एक अवयव सम हो।
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