discreteplot y = Power[6,k] * Power[e,(-6)] / k! for k from 0 .. 12, discreteplot y = Power[3,k] * Power[e,(-3)] / k! for k from 0 .. 12

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.