The first terms are cubes of 1,2,4,7,….tk

find the sum of terms in nth group (1^3),(2^3,3^3),(4^3,5^3,6^3),……..a)18n^3(n^2+1)(n^2+3)b)116n^3(n^2+16)(n^2+12)c)112n^3(n^2+2)(n^2+4)d) none of these

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