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An identity thief is trying to break into someone's computer that is protected by a 4-digit passcode where numbers can repeat. The thief knows that the first digit is 2 and the last digit is 7, 8 or 9. If the thief can attempt 60 passcodes per hour, what is the longest that they could take to break into the computer?

An identity thief is trying to break into someone's computer that is protected by a 4-digit passcode where numbers can repeat. The thief knows that the first digit is 2 and the last digit is 7, 8 or 9. If the thief can attempt 60 passcodes per hour, what is the longest that they could take to break into the computer?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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An identity thief is trying to break into someone's computer that is protected by a 4-digit passcode where numbers can repeat. The thief knows that the first digit is 2 and the last digit is 7, 8 or 9. If the thief can attempt 60 passcodes per hour, what is the longest that they could take to break into the computer? Answer:
Transcribed Image Text:An identity thief is trying to break into someone's computer that is protected by a 4-digit passcode where numbers can repeat. The thief knows that the first digit is 2 and the last digit is 7, 8 or 9. If the thief can attempt 60 passcodes per hour, what is the longest that they could take to break into the computer? Answer:
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