यदि \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\) और \(B=\{4,5\}\) है, तो (\(A\cup B\)') में कितने अवयव हैं?

If \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\), and \(B=\{4,5\}\), how many elements are in (\(A\cup B\)')?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

\(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.

Step 2

Why this answer is correct

The correct answer is A. (3). \(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.

Step 3

Exam Tip

\(A\cup B={1,2,3,4,5}\), इसलिए पूरक ({6,7,8}) में (3) अवयव हैं। पहले संघ की संख्या देखें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\) और \(B=\{4,5\}\) है, तो (\(A\cup B\)') में कितने अवयव हैं? / If \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\), and \(B=\{4,5\}\), how many elements are in (\(A\cup B\)')?

Correct Answer: A. (3). Explanation: \(A\cup B={1,2,3,4,5}\), इसलिए पूरक ({6,7,8}) में (3) अवयव हैं। पहले संघ की संख्या देखें। / \(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.

Which concept should I revise for this Mathematics MCQ?

\(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.

What exam hint can help solve this Mathematics question?

\(A\cup B={1,2,3,4,5}\), इसलिए पूरक ({6,7,8}) में (3) अवयव हैं। पहले संघ की संख्या देखें।