यदि \(A=\{1,2,3,4\}\), \(B=\{1,2,3\}\) और \(S=\{(a,b)\in A\times B:a+b\ge5\}\), तो (n(S)) कितना है?
If \(A=\{1,2,3,4\}\), \(B=\{1,2,3\}\), and \(S=\{(a,b)\in A\times B:a+b\ge5\}\), what is (n(S))?
Explanation opens after your attempt
C. (6)
Concept
For (a=1,2,3,4), the counts are (0,1,2,3), totaling (6). Do not forget equality in a boundary inequality.
Why this answer is correct
The correct answer is C. (6). For (a=1,2,3,4), the counts are (0,1,2,3), totaling (6). Do not forget equality in a boundary inequality.
Exam Tip
(a=1,2,3,4) पर मान क्रमशः (0,0,2,3) नहीं बल्कि (0,1,2,3) हैं, कुल (6) है। सीमा वाली असमता में बराबरी को न भूलें।
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