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Consider the series 2016. n+2015.(n-1)+2...

Consider the series `2016. n+2015.(n-1)+2014.(n-2)+2013.(n-3)+ ,` where `S_n` is the sum of first `n` terns of the series. Which of the following is/are true. (a) `s_n=(n(n+1)(6049-n))/6` (b) `s_n=(n(n+1)(3025-n))/3` (c) `S_(20)=422030` (d) `S_(20)=420700`

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