यदि \(A={x:x^2-7x+12=0}\) और \(B={x:x^2-9x+20=0}\), तो \(A\cup B\) क्या है?
If \(A={x:x^2-7x+12=0}\) and \(B={x:x^2-9x+20=0}\), what is \(A\cup B\)?
Explanation opens after your attempt
A. ( {3,4,5} )
Concept
\(A=\{3,4\}\) and \(B=\{4,5\}\). In a union, the repeated element (4) is written only once.
Why this answer is correct
The correct answer is A. ( {3,4,5} ). \(A=\{3,4\}\) and \(B=\{4,5\}\). In a union, the repeated element (4) is written only once.
Exam Tip
\(A=\{3,4\}\) और \(B=\{4,5\}\) है। संघ में दोहराया अवयव (4) केवल एक बार लिखा जाता है।
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