Question 1
A student has 3 shirts, 7 pants, and 4 pairs of shoes. How many different outfits can be made?
Step-by-Step Solution:
Concept: This problem uses the Fundamental Counting Principle (Multiplication Rule). When making sequential independent choices, multiply the number of options at each step.
Analysis:
- First choice: 3 options
- Second choice: 7 options
- Third choice: 4 options
Calculation:
Total ways = 3 × 7 × 4 = 84
Key Principle: For independent sequential events, multiply the number of choices at each stage.
Verification: Each of the 3 first choices can be paired with each of the 7 second choices (3×7=21), and each of these can be combined with any of the 4 third choices.
Concept: This problem uses the Fundamental Counting Principle (Multiplication Rule). When making sequential independent choices, multiply the number of options at each step.
Analysis:
- First choice: 3 options
- Second choice: 7 options
- Third choice: 4 options
Calculation:
Total ways = 3 × 7 × 4 = 84
Key Principle: For independent sequential events, multiply the number of choices at each stage.
Verification: Each of the 3 first choices can be paired with each of the 7 second choices (3×7=21), and each of these can be combined with any of the 4 third choices.