यदि \(A=\{1,2,3\}\) है और \(|A\times B|=12\), तो (|B|) क्या होगा?
If \(A=\{1,2,3\}\) and \(|A\times B|=12\), what is (|B|)?
Explanation opens after your attempt
B. (4)
Concept
Since (|A|=3) and \(3\cdot |B|=12\), we get (|B|=4). Divide to find the unknown cardinality.
Why this answer is correct
The correct answer is B. (4). Since (|A|=3) and \(3\cdot |B|=12\), we get (|B|=4). Divide to find the unknown cardinality.
Exam Tip
(|A|=3) और \(3\cdot |B|=12\), इसलिए (|B|=4)। अज्ञात कार्डिनलिटी निकालने में भाग दें।
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