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A Printing Machine Problem (Posted on 2006-07-19) Difficulty: 3 of 5
A printing machine, capable of only printing the 10 digits, prints the right digit 12% of the time. Whenever the machine prints erroneously, all wrong possibilities are equally likely.

If a random key is pressed twice and a same digit comes out both times, what is the probability that it was the correct one?

See The Solution Submitted by K Sengupta    
Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: How often is it wrong?Gregor2006-08-14 08:46:48
How often is it wrong?Caz2006-07-22 20:30:47
My Printer is BetterRichard2006-07-19 13:36:08
SolutionSpoilere.g.2006-07-19 11:53:11
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