यदि (n\(A\cup B\)=12), (n(A)=7) और (n(B)=8) है, तो (n\(A\cap B\)) कितना है?

If (n\(A\cup B\)=12), (n(A)=7), and (n(B)=8), what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

C. (3)

Step 1

Concept

From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.

Step 2

Why this answer is correct

The correct answer is C. (3). From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.

Step 3

Exam Tip

सूत्र से (n\(A\cap B\)=7+8-12=3) होगा। संघ वाला सूत्र उल्टा लगाते समय चिन्ह सही रखें।

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Mathematics Answer, Explanation and Revision Hints

यदि (n\(A\cup B\)=12), (n(A)=7) और (n(B)=8) है, तो (n\(A\cap B\)) कितना है? / If (n\(A\cup B\)=12), (n(A)=7), and (n(B)=8), what is (n\(A\cap B\))?

Correct Answer: C. (3). Explanation: सूत्र से (n\(A\cap B\)=7+8-12=3) होगा। संघ वाला सूत्र उल्टा लगाते समय चिन्ह सही रखें। / From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.

Which concept should I revise for this Mathematics MCQ?

From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.

What exam hint can help solve this Mathematics question?

सूत्र से (n\(A\cap B\)=7+8-12=3) होगा। संघ वाला सूत्र उल्टा लगाते समय चिन्ह सही रखें।