In this screencast, the mathematical simplification of Binomial distribution expression to Poisson distribution expression has been discussed. The demonstration of mathematical simplification was built-on example discussed in a video @Anhttps://youtu.be/QIijnC9QPFY?si=LsJcUSPBlF-hac1M. The example further utilizes the recursive calculation of probabilities from the Poisson distribution function. An example with the use of excel functions is available in a separate video @ https://youtu.be/s96VG_w61mE?si=IlkVgvlOnZY1mY-D.