Factorial NotationDate: 9/8/96 at 14:17:42 From: Anonymous Subject: Determining Infinite Series I am supposed to tell if series (1+1/1!+1/2!+1/3! ...) is infinite. I can't even start it because I don't even know what the "!" means... can you help me? Date: 9/12/96 at 10:22:16 From: Doctor Ken Subject: Re: Determining Infinite Series Hello! I'll tell you what the ! means, and then you see whether you can figure it out from there, okay? There's a joke in math that the ! is someone's attempt to make math LOOK interesting. You know, it's not just 7, it's 7! Anyway, it actually does have a precise meaning, and it's pretty neat too. 7! = 7*6*5*4*3*2*1. Also, 10! = 10*9*8*7*6*5*4*3*2*1. The symbol ! is called "factorial." So 7! is seven factorial. Now what do you think about your problem? -Doctor Ken, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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