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