यदि \(A=\{a,b\}\) और \(B=\{1,2,3,4\}\) हैं, तो \(B\times A\) में कितने अवयव होंगे?
If \(A=\{a,b\}\) and \(B=\{1,2,3,4\}\), how many elements will \(B\times A\) have?
Explanation opens after your attempt
Correct Answer
B. (8)
Concept
\(|B\times A|=|B|\cdot|A|=4\cdot2=8\). Reversing order changes pairs but not the count.
Why this answer is correct
The correct answer is B. (8). \(|B\times A|=|B|\cdot|A|=4\cdot2=8\). Reversing order changes pairs but not the count.
Exam Tip
\(|B\times A|=|B|\cdot|A|=4\cdot2=8\)। क्रम बदलने पर युग्म बदलते हैं, पर संख्या समान रहती है।
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