यदि (n(U)=72) और (n\(A^c\)=3n(A)) है, तो (n(A)) कितना होगा?

If (n(U)=72) and (n\(A^c\)=3n(A)), what is (n(A))?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Let (n(A)=x), then (n\(A^c\)=3x). Hence (x+3x=72), so (x=18).

Step 2

Why this answer is correct

The correct answer is A. (18). Let (n(A)=x), then (n\(A^c\)=3x). Hence (x+3x=72), so (x=18).

Step 3

Exam Tip

मान लें (n(A)=x), तब (n\(A^c\)=3x)। इसलिए (x+3x=72) से (x=18) है।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(U)=72) और (n\(A^c\)=3n(A)) है, तो (n(A)) कितना होगा? / If (n(U)=72) and (n\(A^c\)=3n(A)), what is (n(A))?

Correct Answer: A. (18). Explanation: मान लें (n(A)=x), तब (n\(A^c\)=3x)। इसलिए (x+3x=72) से (x=18) है। / Let (n(A)=x), then (n\(A^c\)=3x). Hence (x+3x=72), so (x=18).

Which concept should I revise for this Mathematics MCQ?

Let (n(A)=x), then (n\(A^c\)=3x). Hence (x+3x=72), so (x=18).

What exam hint can help solve this Mathematics question?

मान लें (n(A)=x), तब (n\(A^c\)=3x)। इसलिए (x+3x=72) से (x=18) है।