यदि (n\(A\cup B\)=20), (n(A)=12) और (n(B)=11) है, तो (n\(A\cap B\)) कितना है?

If (n\(A\cup B\)=20), (n(A)=12), and (n(B)=11), what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

C. (3)

Step 1

Concept

From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.

Step 2

Why this answer is correct

The correct answer is C. (3). From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.

Step 3

Exam Tip

सूत्र से (n\(A\cap B\)=12+11-20=3) है। उल्टा सूत्र लगाते समय संघ को घटाएं।

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Mathematics Answer, Explanation and Revision Hints

यदि (n\(A\cup B\)=20), (n(A)=12) और (n(B)=11) है, तो (n\(A\cap B\)) कितना है? / If (n\(A\cup B\)=20), (n(A)=12), and (n(B)=11), what is (n\(A\cap B\))?

Correct Answer: C. (3). Explanation: सूत्र से (n\(A\cap B\)=12+11-20=3) है। उल्टा सूत्र लगाते समय संघ को घटाएं। / From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.

Which concept should I revise for this Mathematics MCQ?

From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.

What exam hint can help solve this Mathematics question?

सूत्र से (n\(A\cap B\)=12+11-20=3) है। उल्टा सूत्र लगाते समय संघ को घटाएं।