Infinite Series Error - Bug? (again)

*To*: mathgroup at smc.vnet.net*Subject*: [mg124572] Infinite Series Error - Bug? (again)*From*: clashton <clashton at gmail.com>*Date*: Wed, 25 Jan 2012 07:04:14 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

Thanks to everyone who responded (not sure why I cannot see the responses at the newsgroup). Here is something peculiar: Sum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 0, Infinity}] /. {q -> 0.1} gives an error, but (Sum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 0, 1}] /. {q -> 0.1}) + (Sum[ q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 2, Infinity}] /. {q -> 0.1}) gives the correct answer -21.1012