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# There's an 97% chance that students taking Econ 15A this quarter will take Econ 15B next quarter.

There's an 97% chance that students taking Econ 15A this quarter will take Econ 15B next quarter. There is a 65% chance that students taking Econ 15A this quarter will be taking both Econ 15B and Econ 100B. What is the probability of students taking Econ 100B given that they are taking Econ 15B?