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 \(R=\{(a,b):|a-b|=1\}\)?
Correct answer and explanation
D. (6)
Simple Explanation
युग्म हैं ((1,2),(2,1),(2,3),(3,2),(3,4),(4,3))। निरपेक्ष मान में दोनों दिशाएं आती हैं। / The pairs are ((1,2),(2,1),(2,3),(3,2),(3,4),(4,3)). With absolute value, both directions are included.
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