If you have an ATM card, you probably have a PIN consisting of four numbers. Determine how many different four number PIN numbers there can be. (Remember that there are 10 possible digits for each of the numbers, since you can choose 0-9 for each number) (Hint: the answer is NOT 40).

Algebra and Trigonometry (MindTap Course List)
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Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter14: Counting And Probability
Section14.CT: Chapter Test
Problem 3CT: An Internet service provider requires its customer to select a password consisting of four letters...
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3. Please answer each of the following questions.
a. If you have an ATM card, you probably have a PIN consisting of four numbers. Determine how many different
four number PIN numbers there can be. (Remember that there are 10 possible digits for each of the numbers,
since you can choose 0 - 9 for each number) (Hint: the answer is NOT 40).
b. A password used to gain access to a computer account is to consist of two lower-case letters (there are 26
lower-case letters) followed by four numbers. (For example, an eligible password could be "cd2634", another
could be "za8840"). Determine how many different passwords are possible.
c. Suppose you are taking a multiple choice exam consisting of 8 true or false questions. So each question has 2
possible answers. How many different ways are there to answer the test, assuming you leave no questions
blank? (Hint: the answer is NOT 16).
Transcribed Image Text:3. Please answer each of the following questions. a. If you have an ATM card, you probably have a PIN consisting of four numbers. Determine how many different four number PIN numbers there can be. (Remember that there are 10 possible digits for each of the numbers, since you can choose 0 - 9 for each number) (Hint: the answer is NOT 40). b. A password used to gain access to a computer account is to consist of two lower-case letters (there are 26 lower-case letters) followed by four numbers. (For example, an eligible password could be "cd2634", another could be "za8840"). Determine how many different passwords are possible. c. Suppose you are taking a multiple choice exam consisting of 8 true or false questions. So each question has 2 possible answers. How many different ways are there to answer the test, assuming you leave no questions blank? (Hint: the answer is NOT 16).
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