यदि (n(A)=54), (n(B)=61) और ठीक एक समुच्चय में (73) तत्व हैं, तो (n\(A\cap B\)) कितना होगा?

If (n(A)=54), (n(B)=61), and (73) elements are in exactly one set, what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

C. (21)

Step 1

Concept

Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).

Step 2

Why this answer is correct

The correct answer is C. (21). Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).

Step 3

Exam Tip

ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (73=115-2x), तो (x=21)।

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यदि (n(A)=54), (n(B)=61) और ठीक एक समुच्चय में (73) तत्व हैं, तो (n\(A\cap B\)) कितना होगा? / If (n(A)=54), (n(B)=61), and (73) elements are in exactly one set, what is (n\(A\cap B\))?

Correct Answer: C. (21). Explanation: ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (73=115-2x), तो (x=21)। / Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).

Which concept should I revise for this Mathematics MCQ?

Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).

What exam hint can help solve this Mathematics question?

ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (73=115-2x), तो (x=21)।