Tuesday, March 29, 2016

An interesting little problem

Here is a version of a simple problem published recently in The Times of London. Apparently a high percentage of people get it wrong at first try. (I did...)

Alex is looking at Kris, but Kris is looking at Jessie.

Alex is married. Jessie is not married.

Is a married person looking at an unmarried person?

(a) Yes
(b) No
(c) The information is insufficient to know this
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2 comments:

  1. davidgMarch 29, 2016 at 4:59 PM

    a) assuming that a person can only be either married or unmarried, then...
    i) if Kris is unmarried, and alex is looking at him then a married person is looking at an unmarried persion.
    i)) if Kris is married, then he is a married person looking at Jessie, an unmarried person.

    ReplyDelete
  2. davidgMarch 29, 2016 at 5:01 PM

    a) assuming that a person can only be either married or unmarried, then...
    i) if Kris is unmarried, and alex is looking at him then a married person is looking at an unmarried persion.
    i)) if Kris is married, then he is a married person looking at Jessie, an unmarried person.

    ReplyDelete

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