यदि (n(A)=21), केवल (A) (13), और (n(B-A)=10), तो (n\(A\cup B\)) क्या है?

If (n(A)=21), only (A) is (13), and (n(B-A)=10), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

B. (31)

Step 1

Concept

First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).

Step 2

Why this answer is correct

The correct answer is B. (31). First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).

Step 3

Exam Tip

पहले साझा भाग (21-13=8) है। फिर (n\(A\cup B\)=13+8+10=31)।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=21), केवल (A) (13), और (n(B-A)=10), तो (n\(A\cup B\)) क्या है? / If (n(A)=21), only (A) is (13), and (n(B-A)=10), what is (n\(A\cup B\))?

Correct Answer: B. (31). Explanation: पहले साझा भाग (21-13=8) है। फिर (n\(A\cup B\)=13+8+10=31)। / First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).

Which concept should I revise for this Mathematics MCQ?

First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).

What exam hint can help solve this Mathematics question?

पहले साझा भाग (21-13=8) है। फिर (n\(A\cup B\)=13+8+10=31)।