समुच्चय \(A=\{1,2,3,4\}\) पर \(R=\{(a,b):|a-b|=1\}\) में कितने ordered pairs हैं?
On \(A=\{1,2,3,4\}\), how many ordered pairs are in \(R=\{(a,b):|a-b|=1\}\)?
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C. (6)
Simple Explanation
युग्म ( (1,2),(2,1),(2,3),(3,2),(3,4),(4,3) ) हैं, इसलिए संख्या (6) है। परीक्षा में absolute difference के कारण दोनों दिशाएं लें। / The pairs are ( (1,2),(2,1),(2,3),(3,2),(3,4),(4,3) ), so the count is (6). In exams, take both directions because of absolute difference.
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