Jee Main
Sequences And Series
JEE Main 2022 (Online) 26th July Morning Shift
MCQ+4 / -12022
Consider 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 \({(2)^{{{225} \over 8}}}\), then \(\sum\limits_{k = 1}^n {k(n - k)}\) is equal to :