Homework Answers
here for first digit there are 10 choices of an integer ; for second digit there are 9 choices except a 5 and for third digit there are 8 choices except 3 or 4;
hence number of possible arrangements =10*9*8=720
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A pin-code consist of 3 numbers. We know that the second digit is not a 5...
If we create a 4 digit pin number using only the digits {0,1,2,3,4}, how many unique...
If we create a 4 digit pin number using only the digits {0,1,2,3,4}, how many unique 4 digit pin numbers can we make?
Pin Encryption Write a block of source code to encrypt a four digit pin number by...
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How many 5-digit odd whole numbers are there if there is no leading zero, the third...
How many 5-digit odd whole numbers are there if there is no leading zero, the third digit must be 6, and the second digit must be greater than zero and divisible by 4. No digits may repeat. PLEASE HELP. Thank you!
Access code for a car security system consist of six digits. The first digit cannot be...
Access code for a car security system consist of six digits. The first digit cannot be nine and the last digit must be odd. How many different codes are available. Note that zero is considered an even number.
Suppose that a "code" consists of 5 digits, none of which is repeated. (A digit is...
Suppose that a "code" consists of 5 digits, none of which is repeated. (A digit is one of the 10 numbers 0,1 2,3 4,5 6,7 8,9.) How many codes are possible?
Suppose we want to form three-digit numbers using the set of digits (0,1,2,3,4,5). For example, 301...
Suppose we want to form three-digit numbers using the set of digits (0,1,2,3,4,5). For example, 301 and 223 are such numbers, but 037 is not. How many such numbers are possible? There are three-digit numbers formed by using the digits {0,1,2,3,4,5).
A thief steals an ATM card and randomly must guess the correct five- digit pin code...
A thief steals an ATM card and randomly must guess the correct five- digit pin code from a 6- key keypad. The number of possible codes is? The probability that the correct code is given on the first try is?
What is the probability that you guess the correct 4 digit pin of a bank account...
What is the probability that you guess the correct 4 digit pin of a bank account if you know it repeats two numbers at least once?
A thief steals an ATM card and must randomly guess the correct six-digit pin code from...
A thief steals an ATM card and must randomly guess the correct six-digit pin code from a 4-key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try? The number of possible codes is (Type an integer or fraction. Simplify your answer.) The probability that the correct code is given on the first try is
In the US, telephone numbers are 7-digit long. While in general they have some restrictions, for ...
In the US, telephone numbers are 7-digit long. While in general they have some restrictions, for example, they cannot start with 0 or 1, here we assume that all 7-digit sequences are possible, even 0000000. How many phone numbers: start or end with the two identical digits, for example 0012345, 1234511, or 2222222, contain a 5-digit consecutive substring. For example 0034567, 2567892, or 1234567
In the US, telephone numbers are 7-digit long. While in general they have some restrictions, for...
Suppose we want to form three-digit numbers using the set of digits (0,1,2,3,4,5). For example, 301 and 223 are such numbers, but 037 is not. How many such numbers are possible? There are three-digit numbers formed by using the digits {0,1,2,3,4,5).
In the US, telephone numbers are 7-digit long. While in general they have some restrictions, for example, they cannot start with 0 or 1, here we assume that all 7-digit sequences are possible, even 0000000. How many phone numbers: start or end with the two identical digits, for example 0012345, 1234511, or 2222222, contain a 5-digit consecutive substring. For example 0034567, 2567892, or 1234567
In the US, telephone numbers are 7-digit long. While in general they have some restrictions, for...
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