Question

Given that the product of the first n terms of a geometric sequence is P ,find \[\prod_{k=1}^{n-1}a_{3k-1}\] if the terms are \[a_1,a_2,a_3...a_n\]

Answer 1

hence show that if the sum is S
\[S\ge n\sqrt{P}\]

Answer 2

http://math.stackexchange.com/questions/477988/geometric-sequence-with-product-p/478007#478007