InterviewSolution
`(n (n+1) (n+2) )/( 6) ``(n (n +1) (3n^(2) + 23n + 46))/( 12)``(n(27n^(3) + 90n^(2) + 45n- 50))/( 4)``(n (n+1) (2n +1) )/( 6)`
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