Math Problem Statement
Solution
To solve the problem:
We are tasked with finding the number of five-digit numbers with distinct digits that do not include the digits 4, 6, or 7.
Step-by-Step Solution:
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Available digits: The total digits are . These exclude , leaving us with 7 digits.
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Creating five-digit numbers:
- A five-digit number cannot start with (as it would no longer be a five-digit number).
- So, for the first digit, we have valid choices ().
- For the second digit, we have remaining choices (since one digit is already used, and is now valid).
- For the third digit, choices remain.
- For the fourth digit, choices remain.
- For the fifth digit, choices remain.
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Calculation:
- The total number of valid five-digit numbers is:
Final Answer:
There are 2160 five-digit numbers with distinct digits that do not contain , , or .
Do you need further explanation or breakdowns?
Related Questions:
- How would the calculation change if all digits were allowed?
- How many such numbers would there be if repetition of digits were allowed?
- What if the number must begin with an odd digit?
- How many four-digit numbers can be formed under similar restrictions?
- Can you derive a general formula for -digit numbers under these constraints?
Tip:
When solving combinatorics problems, always identify constraints like digit exclusions and ordering restrictions to narrow the scope effectively.
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Permutations
Digit Restrictions
Formulas
Total permutations: n! / (n-r)! for selecting r objects from n total objects
Theorems
Basic principles of counting
Suitable Grade Level
Grades 9-12
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