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Find sum of first 15 term of series 1+6+...

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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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAINS-All Questions
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