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Concept explainers
(a)
To find: The number of three digit number formed.
(a)
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Answer to Problem 23E
The number of ways to choose the number is
Explanation of Solution
Given:
The given information is that the leading number is not zero.
Calculation:
The choices for the leading digit other than zero is that for the second digit there are ten choices available and similarly for the third digit there are ten choices too.
Thus, the total number of ways in which the three digit number is chosen is,
(b)
The number of three digit number formed.
(b)
![Check Mark](/static/check-mark.png)
Answer to Problem 23E
To find: The number of ways to choose the number is
Explanation of Solution
Given:
The given information is that the leading number is not zero.and no repletion is allowed.
Calculation:
The choices for the leading digit other than zero and no repetition allowed is other than the two then the total number of ways in which the three digit number is chosen is,
(c)
To find: The number of three digit number formed.
(c)
![Check Mark](/static/check-mark.png)
Answer to Problem 23E
The number of ways to choose the number is
Explanation of Solution
Given:
The given information is that the leading number is not zeroand last digit must be multiple of 5.
Calculation:
The choices for the leading digit other than zero, then the choices for the leading digit is 9. The choice for the second digit is 10 and the choice for the third digit there are only two choices and as the number has to be divisible by 5 then, the number of ways in which the number is made is,
(d)
To find: The number of three digit number formed.
(d)
![Check Mark](/static/check-mark.png)
Answer to Problem 23E
The number of ways to choose the number is
Explanation of Solution
Given:
The given information is that the number is at least 400.
Calculation:
The number is at least 400 then the digits to be used at the first place are
Chapter 9 Solutions
Precalculus with Limits
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