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