Peter Flannery
  • Home
  • Bio
  • Blog
  • First and Only
  • Battle Mage
  • Contact
  • Battle Mage Concept Art
  • Decimus Fate

Cheryl's Birthday (The Flanston's Solution :)

4/14/2015

3 Comments

 
Picture
The Flanston’s Solution

  1.  Albert doesn’t know the month because it could be one of 4 possible options

2.  Bernard does not know the day because it could be one of 6 possible options

3. However, if Bernard had been told 18 or 19 then he would know the date because there is only one option for each

4. The fact that he doesn’t means that both men can rule out June 18 or May 19

5. This leaves two possible options for May

6. One for June

7. Two for July

8. And three for August

9. We can now deduce that both men realise Albert could not have been given June, otherwise he would now know the date because there is only one possible option. We can therefore rule out June 17

10.  This leaves us with two possible options in May

11.  Two in July

12.  And three in August

13.  However, it is Bernard who now realises the answer, so his number must reveal the date

14.  If he had been given 14, 15 or 16 he would still not know because there are still two options for each

15.  Albert realises this

16.  Therefore the only way that both men can deduce the date is if Bernard was told 17
because there is only one remaining option for 17

17.  Thus the solution to the problem is August 17

3 Comments
Chris Grul
3/18/2018 01:55:14 am

This solution is not correct.

Albert knows immediately that Bernard doesn't know. This rules out completely any dates in May and June as if the month were May, Albert couldn't know for sure that the day wasn't the 19th (and thus couldn't be sure Bernard wouldn't know) and similarly, the month cannot be June as Bernard couldn't knkw for sure the day was not 18th. This only leaves dates in July and August. It can't be the 14th as Bernard would not be able to eliminate either as based on Albert's statement Bernard cannot eliminate either month. The day cannot be either 15th or 17th because if it were either of those, it would mean that the month was August and then Albert would not know what the date was after Bernard says he now knows because there are two possibilities. Therefore, the date must be July 16th.

Reply
best assignment writing service link
8/18/2020 03:47:21 am

Ha. You don't go out reasoning you will furnish more than one individual with your digits... now and again for some odd reason after every collaboration there is somebody additionally meriting... yet, by then you can't proceed to request the number back, or request that they overlook/erase it (Not cool).

Reply
Peter
8/18/2020 03:56:03 am

Hi
I'm not really sure what this comment means, but it sounds like you are angry about something. If you could be more specific, I will try to reply as best I can...

Reply



Leave a Reply.

    Picture

    Author

    So, blogging... I'll be honest. I don't really know what a blog is. So I guess I'll just waffle on and see if anyone is interested!

    First Post coming soon! :)

    Archives

    July 2019
    April 2015
    July 2014
    June 2014

    Categories

    All
    About Peter
    Battle Mage
    Fantasy
    Fantasy Maps
    Heaven Hell And Home
    Kindle Countdown
    Maps
    Self Publishing
    Wrath

    RSS Feed

Proudly powered by Weebly