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Summation without Mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg27416] Summation without Mathematica
• From: " mrtommorris" <mor3752 at alltel.net>
• Date: Sun, 25 Feb 2001 00:53:39 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Can someone help me to evaluate the sum from x=1 to infinity for the
expression x^3(7/8)^x. I know the formulas that will evaluate either alone.
But the product is giving me difficulty.