यदि \(A=\{1,2,3\}\) और \(R={(a,b):a+b\) is odd(}) है, तो कौन-सा pair (R) में नहीं है?
If \(A=\{1,2,3\}\) and \(R={(a,b):a+b\) is odd(}), which pair is not in (R)?
Explanation opens after your attempt
C. ( (1,3) )
Concept
Since (1+3=4) is even, ( (1,3) ) is not in the odd-sum relation. Always check the parity of the sum.
Why this answer is correct
The correct answer is C. ( (1,3) ). Since (1+3=4) is even, ( (1,3) ) is not in the odd-sum relation. Always check the parity of the sum.
Exam Tip
(1+3=4) सम है, इसलिए ( (1,3) ) odd-sum relation में नहीं है। sum की parity जरूर जांचें।
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