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
Correct Answer

B. (10)

Step 1

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.

Step 2

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.

Step 3

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।

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Mathematics Answer, Explanation and Revision Hints

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)?

Correct Answer: B. (10). Explanation: (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। / 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.

Which concept should I revise for this Mathematics MCQ?

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.

What exam hint can help solve this Mathematics question?

(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।