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This video lesson covers "[High School Math A] Combinatorics 11: The Rules of Sum and Product" in approximately 14 minutes. The key to solving the problems is: "If 'A → B', use multiplication; if 'A or B', use addition." Please watch the video lesson in the following order: [Key Points] ⇒ [Example Problems] ⇒ [Practice Problems] ⇒ [Summary].

If you have any questions about other topics besides this lesson, please click the URL below.

You can watch video lessons for each topic in one place.

■For those who have questions about "Mathematics I," click here!

Mathematics I: Numbers and Expressions
https://goo.gl/kkMY1W

Mathematics I: Expansion of Equations
https://goo.gl/qgCjRb

Mathematics I: Factorization and Cross-Multiplication
https://goo.gl/Ae70Kr

Mathematics I: Rational Numbers, Irrational Numbers, and Square Roots
https://goo.gl/VyO7Rv

Mathematics I: Equations and Inequalities
https://goo.gl/omHWxP

Mathematics I: Absolute Value and Equations
https://goo.gl/wv1T4f

Mathematics I: Quadratic Equations
https://goo.gl/tyqgHp

Mathematics I: Sets
https://goo.gl/uPzTs3

Mathematics I: Propositions, Necessary Conditions, and Sufficient Conditions
https://goo.gl/9uT75D

Mathematics I: Graphs of Quadratic Functions
ht https://goo.gl/sDgXo1

Mathematics I: Maximum and Minimum Values ​​of Quadratic Functions
https://goo.gl/fIsO2s

Mathematics I: Applications of Quadratic Functions
https://goo.gl/b4WFAW

Mathematics I: Intersection Points of Parabolas and Lines
https://goo.gl/igr3ek

Mathematics I: Quadratic Inequalities
https://goo.gl/21RZov

Mathematics I: Trigonometric Ratios
https://goo.gl/q0cers

Mathematics I: Law of Sines and Law of Cosines
https://goo.gl/W44zp2

Mathematics I: Applications to Area and Volume
https://goo.gl/UPRHnx

Mathematics I: Data Dispersion and Correlation
https://goo.gl/4JhqPf

■ For those who have questions about "Mathematics A," click here!

Mathematics A: Sets and Complementary Sets
https://goo.gl/uB9WnZ

Mathematics A: Combinations and Permutations (Tree Diagrams, Addition Rule, Product Rule)
https://goo.gl/OS72Rb

Mathematics A: Permutations
https://goo.gl/liNVCE

Mathematics A: Circular Permutations and Permutations with Repetition
https://goo.gl/8EQcDC

Mathematics A: Combinations nCr
https://goo.gl/EVfHms

Mathematics A: Application of Combinations
https://goo.gl/vk57MX

Mathematics A: Grouping
https://goo.gl/qOYVj4

Mathematics A: Probability
https://goo.gl/dhyIIV

Mathematics A: Probability: Union and Complementary Events
https://goo.gl/3hQORr

Mathematics A: Probability: Dice and Independent Trials
https://goo.gl/Vfi70n

Mathematics A: Probability: Dice and Repeated Trials
https://goo.gl/ZCPe iC

Mathematics A: Probability - Lottery and Multiplication Theorem
https://goo.gl/UJSHxY

Mathematics A: Properties of Integers
https://goo.gl/of491x

Mathematics A: Prime Factorization
https://goo.gl/7ptLnq

Mathematics A: Multiples and Divisors - Relatively Prime Numbers
https://goo.gl/nGkFLS

Mathematics A: Integer Solutions to Equations
https://goo.gl/7C4xXf

Mathematics A: Integer Solutions to Equations - Quotient and Remainder of Division
https://goo.gl/BVW8MA

Mathematics A: Euclidean Formula Euclidean Algorithm and Linear Diophantine Equations
https://goo.gl/ycG6An

Mathematics A: Fractions and Decimals
https://goo.gl/tqQTjF

Mathematics A: Number Systems (Base n)
https://goo.gl/kt3HVR

Mathematics A: Internal and External Division of Line Segments and Properties of Parallel Lines
https://goo.gl/fqLumM

Mathematics A: Angle Bisectors of Triangles
https://goo.gl/RncX40

Mathematics A: Circumcenter, Incenter, and Centroid of Triangles
https://goo.gl/IhYU3e

Mathematics A: Ceva and Menelaus Theorems

https://goo.gl/pq6m0Y

Mathematics A: Inscribed...