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Ambiguous PIN Code (Posted on 2010-11-17) Difficulty: 3 of 5
Susan couldn't quite remember her bank PIN code.

She knew:

  • It had 4 or 5 digits.
  • It used 4 or 5 different digits.
  • The first digit is 4 or 5.
  • The second digit is 4 or 5 and none of the other digits is smaller.
  • The number is 4 or 5 times a prime number.
  • If you reverse the order of the digits, the resulting number has 4 or 5 prime factors, all different.
  • In 4 or 5 of these facts, the "4" is the correct number.

What is Susan's PIN code?

See The Solution Submitted by Charlie    
Rating: 2.5000 (2 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Good problem!broll2010-11-20 03:30:02
re(3): A Pin that worksJer2010-11-19 16:22:05
re: Possible solutionJer2010-11-19 16:13:10
re(2): A Pin that worksCharlie2010-11-19 12:01:02
re: A Pin that worksbroll2010-11-18 17:08:44
A Pin that worksJer2010-11-18 15:55:00
re: Possible solution -- don't consider this closed yetCharlie2010-11-17 16:30:25
Possible solutionbroll2010-11-17 11:34:53
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