यदि \(A={x:x\in\mathbb{Z},|x|\le 4}\) और \(B={x:x\in\mathbb{Z},x^2-2x-3=0}\) है, तो \(A\setminus B\) में कितने तत्व हैं?

If \(A={x:x\in\mathbb{Z},|x|\le 4}\) and \(B={x:x\in\mathbb{Z},x^2-2x-3=0}\), then how many elements are in \(A\setminus B\)?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

(A) has (9) elements, and \(B=\{-1,3\}\). Therefore \(A\setminus B\) has (9-2=7) elements.

Step 2

Why this answer is correct

The correct answer is A. (7). (A) has (9) elements, and \(B=\{-1,3\}\). Therefore \(A\setminus B\) has (9-2=7) elements.

Step 3

Exam Tip

(A) में (9) तत्व हैं और \(B=\{-1,3\}\) है। इसलिए \(A\setminus B\) में (9-2=7) तत्व हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A={x:x\in\mathbb{Z},|x|\le 4}\) और \(B={x:x\in\mathbb{Z},x^2-2x-3=0}\) है, तो \(A\setminus B\) में कितने तत्व हैं? / If \(A={x:x\in\mathbb{Z},|x|\le 4}\) and \(B={x:x\in\mathbb{Z},x^2-2x-3=0}\), then how many elements are in \(A\setminus B\)?

Correct Answer: A. (7). Explanation: (A) में (9) तत्व हैं और \(B=\{-1,3\}\) है। इसलिए \(A\setminus B\) में (9-2=7) तत्व हैं। / (A) has (9) elements, and \(B=\{-1,3\}\). Therefore \(A\setminus B\) has (9-2=7) elements.

Which concept should I revise for this Mathematics MCQ?

(A) has (9) elements, and \(B=\{-1,3\}\). Therefore \(A\setminus B\) has (9-2=7) elements.

What exam hint can help solve this Mathematics question?

(A) में (9) तत्व हैं और \(B=\{-1,3\}\) है। इसलिए \(A\setminus B\) में (9-2=7) तत्व हैं।