Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
(1+1/3+1/6+1/10+1/14+1/35+1/105+1/210)/((1+1/2)*(1+1/3)*(1+1/5)*(1+1/7))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random