sum question

*To*: mathgroup at smc.vnet.net*Subject*: [mg91169] sum question*From*: "Kopp, Philip F" <philip-kopp at uiowa.edu>*Date*: Fri, 8 Aug 2008 07:14:17 -0400 (EDT)

Hi, I am trying to work with a rather large sum(>200 terms) in Mathematica , but the program displays some odd behavior. When I multiply each term in the sum by 1, I get 1 for the answer. When I change 1 to 1.0, I get an incredibly large number for the answer. There seems to be some problem with using decimal numbers in this large sum. I tried Rationalize[1.0], and it works. What I am really trying to do is multiply each term by a different number(all less than one) that I calculated in another program. These numbers are in decimal form, so I run into the same problem. When I try rationalize here, it doen't fix the problem. Any other suggestions?

**Follow-Ups**:**RE: sum question***From:*"Jose Luis Gomez" <jose.luis.gomez@itesm.mx>