Concept explainers
(a)
To find: the total number of ATM codes possible.
(a)
Answer to Problem 23E
The possible numbers of ATM codes are 100000.
Explanation of Solution
Given information:
ATM personal identification number codes typically consist of four digit sequences of numbers.
Calculation:
First digit can be any one number from 0 to 9.
Second digit can be any one number from 0 to 9.
Third digit can be any one number from 0 to 9.
Fourth digit can be any one number from 0 to 9.
The possible numbers of ATM codes are:
(b)
To find: the total number of ATM codes possible when the first digit is not 0.
(b)
Answer to Problem 23E
The possible numbers of ATM codes when the first digit is not zero are 9000.
Explanation of Solution
Calculation:
First digit can be any one number from 1 to 9.
Second digit can be any one number from 1 to 9.
Third digit can be any one number from 1 to 9.
Fourth digit can be any one number from 1 to 9.
The possible numbers of ATM codes when the first digit is not zero are:
Chapter 8 Solutions
Precalculus with Limits: A Graphing Approach
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