\(यदि (U={1,2,\ldots,20}), (A={x:x \in U\) तथा \(x \le 8}) और (B={x:x \in U\) तथा \(x \ge 14}), तो ((A \cup B)') क्या है\)?
\(If (U={1,2,\ldots,20}), (A={x:x \in U\) and \(x \le 8}), and (B={x:x \in U\) and \(x \ge 14}), what is ((A \cup B)')\)?
Explanation opens after your attempt
Correct Answer
A. ({9,10,11,12,13})
Concept
\(A \cup B\) contains elements from (1) to (8) and from (14) to (20). The middle elements from (9) to (13) remain in the complement.
Why this answer is correct
The correct answer is A. ({9,10,11,12,13}). \(A \cup B\) contains elements from (1) to (8) and from (14) to (20). The middle elements from (9) to (13) remain in the complement.
Exam Tip
\(A \cup B\) में (1) से (8) और (14) से (20) तक के सदस्य हैं। बीच के (9) से (13) तक पूरक में बचते हैं।
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