Date: May 4, 2013 8:50 AM
Author: nagen79@gmail.com
Subject: Probability problem

[Question]
I have N samples with each separated by distance meters. Probability of

each samples are P0.....Pn-1. Now I need to find probability that at
least K of this occurs. There are N samples each with different
probabilities , I need to find out K of them occurs . Each can occur
only once.

[Difficulty]
If it were equal probability things would have been simpler. Since there

can be many combinations now. Total probability of K event out of N
occurring with unequal probability is little tricky. Each can occur only