\(A=\{1,2,3,4\}\) पर \(R=\{(a,b):a+b\le5\}\) है। (R) में कितने युग्म हैं?
On \(A=\{1,2,3,4\}\), \(R=\{(a,b):a+b\le5\}\). How many pairs are in (R)?
Explanation opens after your attempt
C. (10)
Concept
For (a=1,2,3,4), the possible counts of (b) are (4,3,2,1). Total pairs are (4+3+2+1=10).
Why this answer is correct
The correct answer is C. (10). For (a=1,2,3,4), the possible counts of (b) are (4,3,2,1). Total pairs are (4+3+2+1=10).
Exam Tip
(a=1,2,3,4) के लिए (b) की संख्याएं क्रमशः (4,3,2,1) हैं। कुल (4+3+2+1=10) युग्म हैं।
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