find the number in the series
15,25,33,43,51,?

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• A 61
• B 63
• C 65
• D 67

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Answer: A. 61

The series adds 10 and 8 in turn: 15 + 10 = 25, + 8 = 33, + 10 = 43, + 8 = 51. The next step is + 10, giving 61.

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