The sum of the following series
1 + 6 + 9(1² + 2² + 3²)/7 + 12(1² + 2² + 3² + 4²)/9 + 15(1² + 2² + .... + 5²)/11 + .... up to 15 terms, is:
(A) 7820 (B) 7830
(C) 7520 (D) 7510
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