यदि (n(A)=18), (n(B)=22) और (n\(A\cup B\)=31) है, तो (n\(A\setminus B\)) क्या है?

If (n(A)=18), (n(B)=22) and (n\(A\cup B\)=31), what is (n\(A\setminus B\))?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

(n\(A\cap B\)=18+22-31=9), so (n\(A\setminus B\)=18-9=9). Finding the intersection first is often easier.

Step 2

Why this answer is correct

The correct answer is A. (9). (n\(A\cap B\)=18+22-31=9), so (n\(A\setminus B\)=18-9=9). Finding the intersection first is often easier.

Step 3

Exam Tip

(n\(A\cap B\)=18+22-31=9), इसलिए (n\(A\setminus B\)=18-9=9)। पहले प्रतिच्छेद निकालना अक्सर आसान रहता है।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(A)=18), (n(B)=22) और (n\(A\cup B\)=31) है, तो (n\(A\setminus B\)) क्या है? / If (n(A)=18), (n(B)=22) and (n\(A\cup B\)=31), what is (n\(A\setminus B\))?

Correct Answer: A. (9). Explanation: (n\(A\cap B\)=18+22-31=9), इसलिए (n\(A\setminus B\)=18-9=9)। पहले प्रतिच्छेद निकालना अक्सर आसान रहता है। / (n\(A\cap B\)=18+22-31=9), so (n\(A\setminus B\)=18-9=9). Finding the intersection first is often easier.

Which concept should I revise for this Mathematics MCQ?

(n\(A\cap B\)=18+22-31=9), so (n\(A\setminus B\)=18-9=9). Finding the intersection first is often easier.

What exam hint can help solve this Mathematics question?

(n\(A\cap B\)=18+22-31=9), इसलिए (n\(A\setminus B\)=18-9=9)। पहले प्रतिच्छेद निकालना अक्सर आसान रहता है।