Find sum of first 15 term of series `1+6+(9(1^2+2^2+3^2))/7+(12(1^2+2^2+3^2+4^2))/9+......` (1) `7620` (2) `7280` (3) `7820` (4) `7067`

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Find sun of first 15 term of series 1+6+(9(1^2+2^2+3^2))/(7)+(12(1^2+2^2+3^2+4^2))/(9)+ ?. (a) 7620 (b) 7280 (c) 7820 (d) 7067

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