Table of contents
- 0. Fundamental Concepts of Algebra3h 29m
- 1. Equations and Inequalities3h 27m
- 2. Graphs1h 43m
- 3. Functions & Graphs2h 17m
- 4. Polynomial Functions1h 54m
- 5. Rational Functions1h 23m
- 6. Exponential and Logarithmic Functions2h 28m
- 7. Measuring Angles40m
- 8. Trigonometric Functions on Right Triangles2h 5m
- 9. Unit Circle1h 19m
- 10. Graphing Trigonometric Functions1h 19m
- 11. Inverse Trigonometric Functions and Basic Trig Equations1h 41m
- 12. Trigonometric Identities 2h 34m
- 13. Non-Right Triangles1h 38m
- 14. Vectors2h 25m
- 15. Polar Equations2h 5m
- 16. Parametric Equations1h 6m
- 17. Graphing Complex Numbers1h 7m
- 18. Systems of Equations and Matrices3h 6m
- 19. Conic Sections2h 36m
- 20. Sequences, Series & Induction1h 15m
- 21. Combinatorics and Probability1h 45m
- 22. Limits & Continuity1h 49m
- 23. Intro to Derivatives & Area Under the Curve2h 9m
21. Combinatorics and Probability
Combinatorics
Struggling with Precalculus?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
A student formed a club at their school. They have 13 members, and need to elect a president, vice president, and treasurer. How many ways are there to fill these officer positions?
A
2197
B
1716
C
13
D
6

1
Identify the number of positions to be filled: president, vice president, and treasurer. This means there are 3 positions to fill.
Determine the number of choices for the first position (president). Since there are 13 members, there are 13 possible choices for president.
After selecting the president, there are 12 members left. Determine the number of choices for the second position (vice president). There are 12 possible choices for vice president.
After selecting the vice president, there are 11 members left. Determine the number of choices for the third position (treasurer). There are 11 possible choices for treasurer.
Calculate the total number of ways to fill the positions by multiplying the number of choices for each position: 13 (president) * 12 (vice president) * 11 (treasurer).
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