MathematicsMedium178×since 2002Q5183Consider two G.Ps. 2, 2², 2³, ..... and 4, 4², 4³, .... of 60 and n terms respectively. If the geometric mean of all the 60 + n terms is (2)2258{(2)^{{{225} \over 8}}}(2)8225, then ∑k=1nk(n−k)\sum\limits_{k = 1}^n {k(n - k)}k=1∑nk(n−k) is equal to :A560B1540C1330D2600Check answerSkip