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B
10
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C
20
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D
30
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Solution
The correct option is B10 Given series is: 2, 6, 10, 20, 30, 42, 56. Here, the difference between consecutive terms is as: +4, +6, +8, +10, +12, +14. Clearly, 6 + 6 = 12. Hence, option (B) is the correct answer.