POLS 2400 Lecture Notes - Lecture 22: Binomial Coefficient, Sample Space

• School: Northeastern University
• Department: Political Science
• Course: POLS 2400
• Professor: Colin Brown

Document Summary

Rock paper scissors: 9 possible outcomes, a is at least 1 paper, b is at least 1 scissor, p (a or b) = p(a) + p(b) p (a and b) Permutations & combinations: how many different ways can we arrange a set of objects, permutations: order matters, can we use the same number twice, depends on situation, with replacement . / (n-k): combinations: order doesn"t matter, factorials, n! * (n-k): n choose k i. e. picking a group of 4 out of 5 people, it would be 5 choose 4 , total number c amount chosen, currently (in this class), assuming everything is equally likely, gives baseline.