1. ## Solve probability expression

Hello,
How can solve this?
If Pn < 1
Thanks

2. ## Re: Solve probability expression

assuming $P_n$ is a probability distribution on the natural numbers then

$\displaystyle{\sum_{n=1}^\infty}~P_n = 1$

3. ## Re: Solve probability expression

Hey life24.

How many events in your distribution?

4. ## Re: Solve probability expression

There is nothing here to solve! You have a statement that is true for every probability distribution. What is it you want to "solve"?