Engineering Board Exam Reviewer · Fundamental Counting Principle · easy
A locker code has 4 digits, each chosen from 0 to 9 with repetition allowed. How many different codes are possible?
- 40
- 10,000
- 5,040
- 9,000
Answer
B. 10,000
Solution
Each of the 4 positions has 10 choices: 104=10,000.
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