समुच्चय \(A=\{1,2,3,4\}\) पर \(R=\{(a,b):|a-b|=1\}\) में कितने युग्म हैं?
On \(A=\{1,2,3,4\}\), how many pairs are in \(R=\{(a,b):|a-b|=1\}\)?
Explanation opens after your attempt
D. (6)
Concept
The pairs are ((1,2),(2,1),(2,3),(3,2),(3,4),(4,3)). With absolute value, both directions are included.
Why this answer is correct
The correct answer is D. (6). The pairs are ((1,2),(2,1),(2,3),(3,2),(3,4),(4,3)). With absolute value, both directions are included.
Exam Tip
युग्म हैं ((1,2),(2,1),(2,3),(3,2),(3,4),(4,3))। निरपेक्ष मान में दोनों दिशाएं आती हैं।
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