Concept explainers
To calculate: To find how many seven-digit phone are available
Answer to Problem 40STP
The number of seven digit phone numbers available are
Explanation of Solution
Given information: Seven digit phone numbers if a digit can be used only once and the first digit cannot be zero or one
Formula Used:
Probability is defined as the likelihood of an event.
Probability is calculated as
Calculation:
Given seven digit phone numbers if a digit can be used only once and the first digit cannot be zero or one
Number of digits
Number of digits possible at each place starting from left
_8_ _9_ _8__7__6__5__4__3_
Hence, total number of seven digit phone numbers is calculated as
Conclusion:
Hence, number of seven digit phone numbers available are
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