\(यदि (A={x:x\in \mathbb{N}, x\le 12}) और (B={x:x\in \mathbb{N}, x\) वर्ग संख्या है\(, x\le 12}), तो (A-B) में कितने अवयव हैं\)?
\(If (A={x:x\in \mathbb{N}, x\le 12}) and (B={x:x\in \mathbb{N}, x\) is a square number\(, x\le 12}), how many elements are in (A-B)\)?
Explanation opens after your attempt
B. (9)
Concept
(A) has (12) elements and \(B=\{1,4,9\}\). Thus (A-B) has (12-3=9) elements.
Why this answer is correct
The correct answer is B. (9). (A) has (12) elements and \(B=\{1,4,9\}\). Thus (A-B) has (12-3=9) elements.
Exam Tip
(A) में (12) अवयव हैं और \(B=\{1,4,9\}\) है। इसलिए (A-B) में (12-3=9) अवयव होंगे।
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