There is a class of 20 students, S1, S2, S3, . . . , S20. We need to form a study group of at least 2 students. The study group must include at least one of S1, S2 or S3. How many ways do we have forming the study group?

There is a class of 20 students, S1, S2, S3, . . . , S20. We need to form a study group of at least 2 students. The study group must include at least one of S1, S2 or S3. How many ways do we have forming the study group?

College Algebra

1st Edition

ISBN:9781938168383

Author:Jay Abramson

Publisher:Jay Abramson

Chapter9: Sequences, Probability And Counting Theory

Section9.5: Counting Principles

Problem 40SE: A family consisting of 2 parents and 3 children is to pose for a picture with 2 family members in...

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Question

There is a class of 20 students, S1, S2, S3, . . . , S20. We need to form a study group of at
least 2 students. The study group must include at least one of S1, S2 or S3. How many
ways do we have forming the study group?

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