यदि \(A\cap B=\varnothing\), (n(A)=9) और (n(B)=11), तो (n\(A\cup B\)) क्या होगा?

If \(A\cap B=\varnothing\), (n(A)=9), and (n(B)=11), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

B. (20)

Step 1

Concept

For disjoint sets, (n\(A\cap B\)=0). Hence (n\(A\cup B\)=9+11=20).

Step 2

Why this answer is correct

The correct answer is B. (20). For disjoint sets, (n\(A\cap B\)=0). Hence (n\(A\cup B\)=9+11=20).

Step 3

Exam Tip

असंयुक्त समुच्चयों में (n\(A\cap B\)=0) होता है। इसलिए (n\(A\cup B\)=9+11=20)।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A\cap B=\varnothing\), (n(A)=9) और (n(B)=11), तो (n\(A\cup B\)) क्या होगा? / If \(A\cap B=\varnothing\), (n(A)=9), and (n(B)=11), what is (n\(A\cup B\))?

Correct Answer: B. (20). Explanation: असंयुक्त समुच्चयों में (n\(A\cap B\)=0) होता है। इसलिए (n\(A\cup B\)=9+11=20)। / For disjoint sets, (n\(A\cap B\)=0). Hence (n\(A\cup B\)=9+11=20).

Which concept should I revise for this Mathematics MCQ?

For disjoint sets, (n\(A\cap B\)=0). Hence (n\(A\cup B\)=9+11=20).

What exam hint can help solve this Mathematics question?

असंयुक्त समुच्चयों में (n\(A\cap B\)=0) होता है। इसलिए (n\(A\cup B\)=9+11=20)।