यदि \(A=\{1,2,3,4,5\}\) और \(R=\{(a,b):a<b\}\) है, तो (R) में कितने क्रमित युग्म हैं?
If \(A=\{1,2,3,4,5\}\) and \(R=\{(a,b):a<b\}\), how many ordered pairs are in (R)?
Explanation opens after your attempt
B. (10)
Concept
For (5) elements, the number of pairs with (a<b) is \(\binom{5}{2}=10\). In such questions, count each unordered pair in the correct ordered direction.
Why this answer is correct
The correct answer is B. (10). For (5) elements, the number of pairs with (a<b) is \(\binom{5}{2}=10\). In such questions, count each unordered pair in the correct ordered direction.
Exam Tip
(5) अवयवों में (a<b) वाले युग्मों की संख्या \(\binom{5}{2}=10\) है। ऐसे प्रश्नों में unordered जोड़ी को सही ordered दिशा में गिनें।
Login to save your score, XP, coins and progress.
