यदि (n\(A\cup B\)=136), (n(A-B)=49) और (n\(A\cap B\)=31) है, तो (n(B)) कितना होगा?
If (n\(A\cup B\)=136), (n(A-B)=49), and (n\(A\cap B\)=31), what is (n(B))?
Explanation opens after your attempt
C. (87)
Concept
First (n(B-A)=136-49-31=56), then (n(B)=56+31=87). (B) contains only (B) and the common part.
Why this answer is correct
The correct answer is C. (87). First (n(B-A)=136-49-31=56), then (n(B)=56+31=87). (B) contains only (B) and the common part.
Exam Tip
पहले (n(B-A)=136-49-31=56), फिर (n(B)=56+31=87)। (B) में केवल (B) और साझा भाग दोनों आते हैं।
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