perplexus.info :: Probability : 9 labels and 9 jars

9 labels and 9 jars (Posted on 2002-12-09)

There are 9 jars each with unique labels.

Someone has come and removed all the labels and mixed them up.

If you put the labels back on the jars (without knowing the contents), what is the expected number of labels which would match the contents?

See The Solution Submitted by Kozo Morimoto

Rating: 3.5833 (12 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re(2): SOLUTION IS WRONG

| Comment 11 of 15 |

(In reply to re: SOLUTION IS WRONG by Sarah)

actually not true. It is possible to have exactly one correct label, then rotate all labels one jar, and still have exactly one correct.

labels 154678923
jars 123456789

one label correct (jar one). Now rotating one position,

labels 315467892
jars 123456789

one label correct (jar four).

Posted by Cory Taylor on 2003-03-24 04:23:11

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