The answer to “P(correct exactly 4 times)” is broken down into a number of easy to follow steps, and 4 words. Since the solution to 21 from 12.9 chapter was answered, more than 212 students have viewed the full step-by-step answer. College Physics, Volume 1 was written by Patricia and is associated to the ISBN: 9781285737034. The full step-by-step solution to problem: 21 from chapter: 12.9 was answered by Patricia, our top Physics solution expert on 03/09/18, 06:36PM. This textbook survival guide was created for the textbook: College Physics, Volume 1 , edition: 10. This full solution covers the following key subjects: . This expansive textbook survival guide covers 119 chapters, and 7349 solutions.