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Given: n(A) = 25, n(B) = 40 and n(A ∪ B) = 50 To Find: n (A ∩ B) We know that, n(A ∪ B) = n(A) + n(B) - n(A ∩ B) ⇒ n(A ∩ B) = n(A) + n(B) - n(A ∪ B) ⇒ n(A ∩ B) = 25 + 40 - 50 ∴ n(A ∩ B) = 15
120, 125, 140, 165, 210, 245
2, 4, 16, 48, 240, 1440, 10080
5, 13, 41, 185, 1111, 8149
Find the wrong number in given number series.
2556, 2613, 2734, 2841, 3012, 3221
-2, 0, 8, 32, 64, 66
171, 86, 87, 132, 266, 668
1, 18, 44, 81, 131, 198
123, 155, 198, 246, 301, 363