Select the option that is related to the third term in the same way as the second term is related to first term and the sixth term is related to the fifth term.
18: 162 :: 25: ? :: 38: 418
The second number is the product of the first number and the sum of the digits of the first number. 18: 162 = 18 X (1 + 8) = 18 X 9 = 162. 38: 418 = 38 X (3 + 8) = 38 X 11 = 418. 25: 175= 25 X (2 + 5) = 25 X 7 = 175.
If n(A) = 25, n(B) = 40 and n(A ∪ B) = 50, then n(A ∩ B) equals
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