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
A. (18)
Concept
Let (n(A)=x), then (n\(A^c\)=3x). Hence (x+3x=72), so (x=18).
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).
Exam Tip
मान लें (n(A)=x), तब (n\(A^c\)=3x)। इसलिए (x+3x=72) से (x=18) है।
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