The car odometer displays a 6-digit number representing the total number of kilometers the car has travelled.
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Question:
The car odometer displays a 6-digit number representing the total number of kilometers the car has travelled.
1. How many different numbers one can read on this device?
2. How many numbers contain exactly 3 times digit 5?
3. How many numbers contain digit 5 at least 3 times?
4. How many numbers contain digit 5 at least once?
Related Book For
Digital Design and Computer Architecture
ISBN: 978-0123944245
2nd edition
Authors: David Harris, Sarah Harris
Posted Date: