\(यदि (A={x:x\) का गुणज 3 है\(, 1\le x\le 20}) और (B={x:x\) का गुणज 5 है\(, 1\le x\le 20}), तो (A\cap B) क्या है\)?
\(If (A={x:x\) is a multiple of \(3, 1\le x\le 20}) and (B={x:x\) is a multiple of \(5, 1\le x\le 20}), what is (A\cap B)\)?
Explanation opens after your attempt
A. ( {15} )
Concept
Only (15) up to (20) is a multiple of both (3) and (5). Hence the intersection is ({15}).
Why this answer is correct
The correct answer is A. ( {15} ). Only (15) up to (20) is a multiple of both (3) and (5). Hence the intersection is ({15}).
Exam Tip
(3) और (5) दोनों के गुणज में (15) ही (20) तक आता है। इसलिए प्रतिच्छेद ({15}) है।
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