यदि \(A=\{2,4,8\}\) और \(B=\{1,7\}\) हैं, तो \(A\times B\) में पहले घटक (4) वाले कितने युग्म होंगे?
If \(A=\{2,4,8\}\) and \(B=\{1,7\}\), how many pairs in \(A\times B\) have first component (4)?
Explanation opens after your attempt
Correct Answer
B. (2)
Concept
The first component (4) is fixed and the second component comes from the (2) elements of (B). With a fixed first component, the count is (n(B)).
Why this answer is correct
The correct answer is B. (2). The first component (4) is fixed and the second component comes from the (2) elements of (B). With a fixed first component, the count is (n(B)).
Exam Tip
पहला घटक (4) निश्चित है और दूसरा घटक (B) के (2) तत्वों में से आएगा। निश्चित पहले घटक पर संख्या (n(B)) होती है।
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