यदि \(A=\{2,4,6,8\}\) और \(B=\{1\}\) हैं, तो \(B\times A\) में कितने तत्व होंगे?
If \(A=\{2,4,6,8\}\) and \(B=\{1\}\), how many elements are in \(B\times A\)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
(n\(B\times A\)=n(B)n(A)=1\times 4=4). The reversed product also follows the multiplication rule for count.
Why this answer is correct
The correct answer is B. (4). (n\(B\times A\)=n(B)n(A)=1\times 4=4). The reversed product also follows the multiplication rule for count.
Exam Tip
(n\(B\times A\)=n(B)n(A)=1\times 4=4)। उल्टा गुणन भी संख्या में गुणा नियम ही देता है।
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