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What number should replace the question mark in the series: 2, 6, 12, 20, ?

Answer: B. 42
The series follows the pattern of n(n+1) where n is the position in the series: 1(1+1)=2, 2(2+1)=6, 3(3+1)=12, 4(4+1)=20, thus 5(5+1)=30.
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