\(यदि (A={x\in\mathbb{N}:x\le25,\ x\) अभाज्य है\(}) और (B={x\in\mathbb{N}:x\le25,\ x\) विषम है}), तो (B-A) क्या है?
\(If (A={x\in\mathbb{N}:x\le25,\ x\) is prime\(}) and (B={x\in\mathbb{N}:x\le25,\ x\) is odd}), what is (B-A)?
Explanation opens after your attempt
Correct Answer
A. ({1,9,15,21,25})
Concept
From the odd numbers in (B), remove the primes in (A). The remaining odd composites and (1) are ({1,9,15,21,25}).
Why this answer is correct
The correct answer is A. ({1,9,15,21,25}). From the odd numbers in (B), remove the primes in (A). The remaining odd composites and (1) are ({1,9,15,21,25}).
Exam Tip
(B) की विषम संख्याओं में से अभाज्य संख्याएं हटानी हैं। इसलिए बची हुई विषम संयुक्त संख्याएं और (1), अर्थात ({1,9,15,21,25}), मिलती हैं।
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