Fred has a four-digit Personal Identification Number (PIN) for his card to draw money out of his bank account. All possible 10000 numbers are allowed. His bank has an unusual security system: it requires customers to get exactly one digit wrong each time, and not to use the same four-digit code as was used the previous time. Someone steals his card, but has no information about Fred's PIN. How many numbers that the thief could try would be accepted as valid?

Fred has a four-digit Personal Identification Number (PIN) for his card to draw money out of his bank account. All possible 10000 numbers are allowed. His bank has an unusual security system: it requires customers to get exactly one digit wrong each time, and not to use the same four-digit code as was used the previous time. Someone steals his card, but has no information about Fred's PIN. How many numbers that the thief could try would be accepted as valid?

Name: Fred has a four-digit Personal Identification Number (PIN) for his ca
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Description: Fred has a four-digit Personal Identification Number (PIN) for his card to draw money out of hisbank account. All possible 10000 numbers are allowed. His bank has an unusual securitysystem: it requires customers to get exactly one digit wrong each t

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter2: Working With Real Numbers

Section2.3: Rules For Addition

Problem 7P

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Fred has a four-digit Personal Identification Number (PIN) for his card to draw money out of his bank account. All possible 10000 numbers are allowed. His bank has an unusual security system: it requires customers to get exactly one digit wrong each time, and not to use the same four-digit code as was used the previous time. Someone steals his card, but has no information about Fred's PIN. How many numbers that the thief could try would be accepted as valid? 4 35 36 Studente, draw anywhere on this slide A.
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