यदि \(A=\{2,5\}\) और \(B=\{7,8\}\) है, तो \(A\times B\) में पहले घटक (2) वाले कितने युग्म होंगे?
If \(A=\{2,5\}\) and \(B=\{7,8\}\), how many pairs in \(A\times B\) have first component (2)?
Explanation opens after your attempt
B. (2)
Concept
The first component (2) is fixed and the second component is chosen from the (2) elements of (B). Therefore, there are (2) such pairs.
Why this answer is correct
The correct answer is B. (2). The first component (2) is fixed and the second component is chosen from the (2) elements of (B). Therefore, there are (2) such pairs.
Exam Tip
पहला घटक (2) तय है और दूसरा घटक (B) के (2) तत्वों में से चुना जाएगा। इसलिए ऐसे (2) युग्म होंगे।
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