Binomial probability - summing probabilities vs. using the complement and cumulative probability

This video shows how to calculate an "at least" amount. The first 2:55 of the video shows how to find the individual probabilities and then sum them. The next 2:00 of the video shows how to use the complement and the cumulative probability distribution function, which is a bit faster.

MyMathLab, Triola, Essentials of Statistics, 5th edition. Section 5.3, #35