यदि \(A=\{1,2,3,4,5\}\) और \(B=\{3,6,9,12\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (b=3a) है?

If \(A=\{1,2,3,4,5\}\) and \(B=\{3,6,9,12\}\), how many pairs ((a,b)) in \(A\times B\) satisfy (b=3a)?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

For (a=1,2,3,4), we get (b=3,6,9,12), but for (a=5), \(15\notin B\). Hence there are (4) pairs.

Step 2

Why this answer is correct

The correct answer is C. (4). For (a=1,2,3,4), we get (b=3,6,9,12), but for (a=5), \(15\notin B\). Hence there are (4) pairs.

Step 3

Exam Tip

(a=1,2,3,4) पर (b=3,6,9,12) मिलता है, पर (a=5) पर \(15\notin B\)। इसलिए (4) युग्म हैं।

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यदि \(A=\{1,2,3,4,5\}\) और \(B=\{3,6,9,12\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (b=3a) है? / If \(A=\{1,2,3,4,5\}\) and \(B=\{3,6,9,12\}\), how many pairs ((a,b)) in \(A\times B\) satisfy (b=3a)?

Correct Answer: C. (4). Explanation: (a=1,2,3,4) पर (b=3,6,9,12) मिलता है, पर (a=5) पर \(15\notin B\)। इसलिए (4) युग्म हैं। / For (a=1,2,3,4), we get (b=3,6,9,12), but for (a=5), \(15\notin B\). Hence there are (4) pairs.

Which concept should I revise for this Mathematics MCQ?

For (a=1,2,3,4), we get (b=3,6,9,12), but for (a=5), \(15\notin B\). Hence there are (4) pairs.

What exam hint can help solve this Mathematics question?

(a=1,2,3,4) पर (b=3,6,9,12) मिलता है, पर (a=5) पर \(15\notin B\)। इसलिए (4) युग्म हैं।