New Posts For Thread: brain games mathmatical question..https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-questionyou have a choice of 3 boxes box 1 box 2 and box 3, in one of them is £100, in the other two there is nothing.Say you choose box number 1.Then box number 3 is opened revealing nothing.You are then given the option to change your box number 1 to bodoes the fact that the second box is thatempty mean that there is now a 66% chance that youhavethe right box because that is what it was for the 2 boxeshttps://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323729#541323729does the fact that the second box is thatempty mean that there is now a 66% chance that youhavethe right box because that is what it was for the 2 boxesSat, 06 Sep 2014 07:43:24 -0500But if the box is empty shkuld you not swop because there was origionallya 66% cbance that one of you would be right. Therefore increasimg your chancesif the other is seen to be empty.https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323651#541323651But if the box is empty shkuld you not swop because there was origionallya 66% cbance that one of you would be right. Therefore increasimg your chancesif the other is seen to be empty.Sat, 06 Sep 2014 07:37:17 -0500naydam i was going on the assumption that the contents are unknown but thatthe box that is opened has of course to be empty...there is no point swapping then :-)https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323631#541323631naydam i was going on the assumption that the contents are unknown but thatthe box that is opened has of course to be empty...there is no point swapping then :-)Sat, 06 Sep 2014 07:34:29 -0500Lfc. So is it OK if the first box opened contains the prize? What do you do then? Start again?What happens after 24 ti8mes of picking the prize box first? All go home?https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323587#541323587Lfc. So is it OK if the first box opened contains the prize? What do you do then? Start again?What happens after 24 ti8mes of picking the prize box first? All go home?Sat, 06 Sep 2014 07:29:37 -0500To convince someone, put a pack of cards face down, ask them to pick out, say, the ace of spades.Now, they are 51/1 to pick it, ok?Now, you take the other 51, look through them, pick one and show him the other 50.Now, is he still 51/1 or is he evens?https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323569#541323569To convince someone, put a pack of cards face down, ask them to pick out, say, the ace of spades.Now, they are 51/1 to pick it, ok?Now, you take the other 51, look through them, pick one and show him the other 50.Now, is he still 51/1 or is he evens?Sat, 06 Sep 2014 07:27:42 -0500Also at the start there is a 2 in 3 chance that the box with money willhave been picked. If when the second box is empty does this increasethe chance of the 1st being right and so it would be better not to swophttps://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323535#541323535Also at the start there is a 2 in 3 chance that the box with money willhave been picked. If when the second box is empty does this increasethe chance of the 1st being right and so it would be better not to swopSat, 06 Sep 2014 07:23:50 -0500Nailedontip. Yes it is much easier to see with more original boxes. But some of these posters don't realise that, with 100 boxes, the puzzle wouldn't work 99 times out of !00. Unless the box-opener KNOWS which are the empty ones!https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323533#541323533Nailedontip. Yes it is much easier to see with more original boxes. But some of these posters don't realise that, with 100 boxes, the puzzle wouldn't work 99 times out of !00. Unless the box-opener KNOWS which are the empty ones!Sat, 06 Sep 2014 07:23:37 -0500Ok then. I agree that the person opening the boxes does NOT need to know which are empty. But this would mean that once in every three repetitions of the game the first box opened would be the prize box...thereby totally ruining the whole point of thhttps://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541323463#541323463Ok then. I agree that the person opening the boxes does NOT need to know which are empty. But this would mean that once in every three repetitions of the game the first box opened would be the prize box...thereby totally ruining the whole point of thSat, 06 Sep 2014 07:16:08 -0500^^^ most elegant clarificationhttps://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541322377#541322377^^^ most elegant clarificationSat, 06 Sep 2014 04:59:03 -0500Fought against this for a while. Only made sense when someone explained with more boxes.Pick a box out of 100, 98 empties get removed, dont know what odds on the other box but loads better than my 99/1https://community.betfair.com/chit_chat/go/thread/view/94038/30341179/brain-games-mathmatical-question?post_id=541322149#541322149Fought against this for a while. Only made sense when someone explained with more boxes.Pick a box out of 100, 98 empties get removed, dont know what odds on the other box but loads better than my 99/1Sat, 06 Sep 2014 04:23:38 -0500