यदि (n(A)=55), (n(B)=62), (n(A-B)=23) है, तो (n\(A\cup B\)) कितना है?

If (n(A)=55), (n(B)=62), (n(A-B)=23), then what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (85)

Step 1

Concept

(n\(A\cap B\)=55-23=32), so (n\(A\cup B\)=55+62-32=85). First find the common part and then the union.

Step 2

Why this answer is correct

The correct answer is A. (85). (n\(A\cap B\)=55-23=32), so (n\(A\cup B\)=55+62-32=85). First find the common part and then the union.

Step 3

Exam Tip

(n\(A\cap B\)=55-23=32), इसलिए (n\(A\cup B\)=55+62-32=85) है। पहले साझा भाग खोजें फिर संघ निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=55), (n(B)=62), (n(A-B)=23) है, तो (n\(A\cup B\)) कितना है? / If (n(A)=55), (n(B)=62), (n(A-B)=23), then what is (n\(A\cup B\))?

Correct Answer: A. (85). Explanation: (n\(A\cap B\)=55-23=32), इसलिए (n\(A\cup B\)=55+62-32=85) है। पहले साझा भाग खोजें फिर संघ निकालें। / (n\(A\cap B\)=55-23=32), so (n\(A\cup B\)=55+62-32=85). First find the common part and then the union.

Which concept should I revise for this Mathematics MCQ?

(n\(A\cap B\)=55-23=32), so (n\(A\cup B\)=55+62-32=85). First find the common part and then the union.

What exam hint can help solve this Mathematics question?

(n\(A\cap B\)=55-23=32), इसलिए (n\(A\cup B\)=55+62-32=85) है। पहले साझा भाग खोजें फिर संघ निकालें।