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_{n=1}^{40} 0.02^{n} \times 0.98^{40-n} \times \binom(40,n)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random