यदि \(A=\{1,2,3\}\), तो \(A\cup \varnothing\) क्या है?
If \(A=\{1,2,3\}\), what is \(A\cup \varnothing\)?
Explanation opens after your attempt
B. ( {1,2,3} )
Concept
The empty set has no element, so it adds nothing to the union. Hence \(A\cup \varnothing=A\).
Why this answer is correct
The correct answer is B. ( {1,2,3} ). The empty set has no element, so it adds nothing to the union. Hence \(A\cup \varnothing=A\).
Exam Tip
रिक्त समुच्चय में कोई अवयव नहीं होता, इसलिए संघ में कुछ नया नहीं जुड़ता। अतः \(A\cup \varnothing=A\)।
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