19 20 42 129 ? 2605 .
19 × 1 + 1 = 20 20 × 2 + 2 = 42 42 × 3 + 3 = 129 129 × 4 + 4 = 520 520 × 5 + 5 = 2605
If n(A) = 25, n(B) = 40 and n(A ∪ B) = 50, then n(A ∩ B) equals
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