\(यदि (A={x:x\) 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
Correct Answer

A. ( {15} )

Step 1

Concept

Only (15) up to (20) is a multiple of both (3) and (5). Hence the intersection is ({15}).

Step 2

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}).

Step 3

Exam Tip

(3) और (5) दोनों के गुणज में (15) ही (20) तक आता है। इसलिए प्रतिच्छेद ({15}) है।

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Mathematics Answer, Explanation and Revision Hints

\(यदि (A={x:x\) 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 \(5, 1\le x\le 20}), what is (A\cap B)\)?

Correct Answer: A. ( {15} ). Explanation: (3) और (5) दोनों के गुणज में (15) ही (20) तक आता है। इसलिए प्रतिच्छेद ({15}) है। / Only (15) up to (20) is a multiple of both (3) and (5). Hence the intersection is ({15}).

Which concept should I revise for this Mathematics MCQ?

Only (15) up to (20) is a multiple of both (3) and (5). Hence the intersection is ({15}).

What exam hint can help solve this Mathematics question?

(3) और (5) दोनों के गुणज में (15) ही (20) तक आता है। इसलिए प्रतिच्छेद ({15}) है।