यदि \(A={x:x\in\mathbb{N},3\mid x,x\le 21}\) और \(B={x:x\in\mathbb{N},7\mid x,x\le 21}\) हैं, तो \(A\cup B\) क्या है?

If \(A={x:x\in\mathbb{N},3\mid x,x\le 21}\) and \(B={x:x\in\mathbb{N},7\mid x,x\le 21}\), what is \(A\cup B\)?

Explanation opens after your attempt
Correct Answer

A. ( {3,6,7,9,12,14,15,18,21} )

Step 1

Concept

(A) has multiples of (3), and (B) has multiples of (7). In the union, do not write (21) twice.

Step 2

Why this answer is correct

The correct answer is A. ( {3,6,7,9,12,14,15,18,21} ). (A) has multiples of (3), and (B) has multiples of (7). In the union, do not write (21) twice.

Step 3

Exam Tip

(A) में (3) के गुणज और (B) में (7) के गुणज हैं। संघ में (21) को दो बार नहीं लिखते।

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FAQs

Mathematics Answer, Explanation and Revision Hints

यदि \(A={x:x\in\mathbb{N},3\mid x,x\le 21}\) और \(B={x:x\in\mathbb{N},7\mid x,x\le 21}\) हैं, तो \(A\cup B\) क्या है? / If \(A={x:x\in\mathbb{N},3\mid x,x\le 21}\) and \(B={x:x\in\mathbb{N},7\mid x,x\le 21}\), what is \(A\cup B\)?

Correct Answer: A. ( {3,6,7,9,12,14,15,18,21} ). Explanation: (A) में (3) के गुणज और (B) में (7) के गुणज हैं। संघ में (21) को दो बार नहीं लिखते। / (A) has multiples of (3), and (B) has multiples of (7). In the union, do not write (21) twice.

Which concept should I revise for this Mathematics MCQ?

(A) has multiples of (3), and (B) has multiples of (7). In the union, do not write (21) twice.

What exam hint can help solve this Mathematics question?

(A) में (3) के गुणज और (B) में (7) के गुणज हैं। संघ में (21) को दो बार नहीं लिखते।