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.
sum (2n+3)/(2n+1) /(2n+2)2
sum (2n+3)/(2n+1) /(2n+2)2
Natural Language
Math Input