যদি n\((A \cup B)\) = 61, n(A) = 30, n(B) = 54 হয় তাহলে n\((A \cap B)\) এর মান কত ? 

A 22 

B   25 

C    23 

D    27 

Solution

Correct Answer: Option C

\(n(A \cup B) = n(A) + n(B) - n(A \cap B)\) 

বা, 61 =30+54 - \(n(A \cap B)\)   
বা, \(n(A \cap B)\) = 84 - 61     
     \(n(A \cap B\) = 23 

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