Mixed Sequence Need help!
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^__^
The answer is 14.
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