Find the missing number in the series: 2, 6, 12, 20, ?

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• A 31
• B 32
• C 33
• D 30

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Answer: D. 30

Explanation: The difference between numbers increases by 2 each time:
2 (+4) = 6
6 (+6) = 12
12 (+8) = 20
20 (+10) = 30.

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