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Learn how to calculate probability with this defective units example problem by Mario's Math Tutoring. We use combinations to solve these probability problems. We go through 3 parts calculating the probability that all 4 units chosen are good, exactly 2 units are good (2 are defective) and then at least 2 units are good.

Timestamps:
00:00 Intro
0:35 Part a) Probability All 4 Widgets are Good
1:00 How to Write Combinations
1:31 What Is Probability and How to Set Up
2:00 Part b) Probability Exactly 2 are Good
2:34 Part c) Probability At Least 2 are Good

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