यदि (n(A)=31), (n(B)=22), और (n\(A\cap B\)=9), तो (n\(A\cup B\)) क्या है?

If (n(A)=31), (n(B)=22), and (n\(A\cap B\)=9), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (44)

Step 1

Concept

(n\(A\cup B\)=31+22-9=44). The common part is subtracted once to avoid double counting.

Step 2

Why this answer is correct

The correct answer is A. (44). (n\(A\cup B\)=31+22-9=44). The common part is subtracted once to avoid double counting.

Step 3

Exam Tip

(n\(A\cup B\)=31+22-9=44)। साझा भाग को दो बार गिनने से बचाने के लिए एक बार घटाते हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=31), (n(B)=22), और (n\(A\cap B\)=9), तो (n\(A\cup B\)) क्या है? / If (n(A)=31), (n(B)=22), and (n\(A\cap B\)=9), what is (n\(A\cup B\))?

Correct Answer: A. (44). Explanation: (n\(A\cup B\)=31+22-9=44)। साझा भाग को दो बार गिनने से बचाने के लिए एक बार घटाते हैं। / (n\(A\cup B\)=31+22-9=44). The common part is subtracted once to avoid double counting.

Which concept should I revise for this Mathematics MCQ?

(n\(A\cup B\)=31+22-9=44). The common part is subtracted once to avoid double counting.

What exam hint can help solve this Mathematics question?

(n\(A\cup B\)=31+22-9=44)। साझा भाग को दो बार गिनने से बचाने के लिए एक बार घटाते हैं।