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#869889 - 02/22/13 01:53 PM DOB logiker
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 15157
Loc: Ottawa Ontario Canada
Jack tells Art and Ben: my birthday is on one of these 10 days:
Mar 4 ; Mar 5 ; Mar 8
Jun 4 ; Jun 7
Sep 1 ; Sep 5
Dec 1 ; Dec 2 ; Dec 8

Jack then tells Art the day, and Ben the month.
Then he asks them: "Do you know when my birthday is?"

Art says: "I don't know"
Ben says: "I knew that you didn't know"
Art says: "Now I know"
Ben says: "Ah, now I also know"

Based on the above dialogue and dates, can you figure out Jack's birthday?
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#870004 - 02/22/13 11:18 PM Re: DOB logiker [Re: CanukDenis]
CCbomber Offline
Addicted Boomer

Registered: 01/16/03
Posts: 3188
Loc: Mojave desert, California
Sep 1 smile

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#870040 - 02/23/13 08:41 AM Re: DOB logiker [Re: CanukDenis]
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 15157
Loc: Ottawa Ontario Canada
Correct.
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#870696 - 02/26/13 10:37 AM Re: DOB logiker [Re: CanukDenis]
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 15157
Loc: Ottawa Ontario Canada
In case someone asks me later and I forgot(!), this is the solution:

Dialogue can be reduced to:
Ben says: "I know that Art doesn't know"
Art says: "Now I know"
Ben says: "Ah, now I also know"

(notice that there is only one "2" and one "7")

Ben says: "I know that Art doesn't know"
Eliminates Jun and Dec, else Ben wouldn't be sure,
since Art could have Jun 7 or Dec 2.

Art says: "Now I know"
Knowing now that month is Jan or Sep, Jan 5 and Sep 5 are eliminated,
since being in both months, Art would not know if he was given 5.

Ben says: "Ah, now I also know"
Only way Ben can know is if he was given Sep, since only "1" is possible;
if given Jan, he'd have the 4th and 8th as possibilities.

So it's Sep 1.
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#870783 - 02/26/13 05:02 PM Re: DOB logiker [Re: CanukDenis]
Flo NS Offline
Addicted Boomer

Registered: 04/11/06
Posts: 4300
Loc: Nova Scotia
Glad you did that because I was going to ask, instead of scratching my head too much.

After all that I'm still scratching.


Edited by Flo NS (02/26/13 05:04 PM)

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