एक कक्षा में (n(A)=86), (n(B)=78) और ठीक एक समुच्चय में (98) विद्यार्थी हैं। (n\(A\cap B\)) कितना होगा?

In a class (n(A)=86), (n(B)=78), and (98) students are in exactly one set. What is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

C. (33)

Step 1

Concept

Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (98=164-2x), hence (x=33).

Step 2

Why this answer is correct

The correct answer is C. (33). Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (98=164-2x), hence (x=33).

Step 3

Exam Tip

ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (98=164-2x), अतः (x=33)।

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एक कक्षा में (n(A)=86), (n(B)=78) और ठीक एक समुच्चय में (98) विद्यार्थी हैं। (n\(A\cap B\)) कितना होगा? / In a class (n(A)=86), (n(B)=78), and (98) students are in exactly one set. What is (n\(A\cap B\))?

Correct Answer: C. (33). Explanation: ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (98=164-2x), अतः (x=33)। / Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (98=164-2x), hence (x=33).

Which concept should I revise for this Mathematics MCQ?

Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (98=164-2x), hence (x=33).

What exam hint can help solve this Mathematics question?

ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (98=164-2x), अतः (x=33)।