an is arithmetic sequence that a*1=2 and a*1<a*2<a*3<.....<a*n suppoed that a*2,a*4,a*8 is in geometric sequence also then find n such that
(Zigma [(a*i)-1]^3) i=1 to n )/(zigma (a*i)^3) i=1 to n )=391/450
Anyone give me a nice solution pleaseee^__^

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