\(यदि (A={x\in\mathbb{N}:x\le30,\ x\) पूर्ण वर्ग है\(}) और (B={x\in\mathbb{N}:x\le30,\ 3\mid x}), तो (A-B) क्या है\)?
\(If (A={x\in\mathbb{N}:x\le30,\ x\) is a perfect square\(}) and (B={x\in\mathbb{N}:x\le30,\ 3\mid x}), what is (A-B)\)?
Explanation opens after your attempt
A. ({1,4,16,25})
Concept
Perfect squares up to (30) are ({1,4,9,16,25}). Removing (9), which is divisible by (3), gives ({1,4,16,25}).
Why this answer is correct
The correct answer is A. ({1,4,16,25}). Perfect squares up to (30) are ({1,4,9,16,25}). Removing (9), which is divisible by (3), gives ({1,4,16,25}).
Exam Tip
(30) तक पूर्ण वर्ग ({1,4,9,16,25}) हैं। इनमें (3) से विभाज्य (9) हटाने पर ({1,4,16,25}) मिलता है।
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