sum from 2 to 6 of 1/5(1-1/6^(n-1)) + sum from 7 to inf of 1555/6^(n-1)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.