If n(A) = 25 n(B) = 18 and n(A ∪ B) = 35 then what is n(A ∩ B)?
यदि n(A) = 25 n(B) = 18 और n(A ∪ B) = 35 है तो n(A ∩ B) कितना होगा?
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Correct Answer
B. 8 / 8
ExplanationStep 1: Use n(A ∪ B) = n(A) + n(B) - n(A ∩ B). Step 2: 35 = 25 + 18 - x gives x = 8. Step 3: Remember the common part is subtracted once in union.
Step 1: सूत्र n(A ∪ B) = n(A) + n(B) - n(A ∩ B) लगाएं। Step 2: 35 = 25 + 18 - x से x = 8 मिलता है। Step 3: यूनियन में common part एक बार घटाया जाता है।