\(यदि (U={x:x\in \mathbb{N}, x\le 20}) और (A={x:x\in U, x\) पूर्ण वर्ग है}), तो (|A'|) क्या है?
\(If (U={x:x\in \mathbb{N}, x\le 20}) and (A={x:x\in U, x\) is a perfect square}), what is (|A'|)?
Explanation opens after your attempt
Correct Answer
C. (16)
Concept
The perfect squares up to (20) are (1,4,9,16), so (|A|=4). Thus (|A'|=20-4=16).
Why this answer is correct
The correct answer is C. (16). The perfect squares up to (20) are (1,4,9,16), so (|A|=4). Thus (|A'|=20-4=16).
Exam Tip
(20) तक पूर्ण वर्ग (1,4,9,16) हैं, इसलिए (|A|=4)। अतः (|A'|=20-4=16)।
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