On Mon, Aug 8, 2011 at 12:40 AM, Puneet Gautam <puneet.nsi...@gmail.com>wrote:
> Sixth toss is independent of previous tosses and dependent only on > coin selection...! > > 1/5 + 4/5(1/2)= 3/5 > > is the correct answer.... > > we want to calc. probability of getting heads the sixth time only.... > even if it would have been 100 th time...3/5 would be the answer > only.. > > It is not independent. Re read the question. The first five times, it HAS to be heads. > > On 8/8/11, Prakash D <cegprak...@gmail.com> wrote: > > 1.) coin is fair > > 2.) coin is unfair > > > > P(head) for unfair coin= 1/5 * 1= 1/5 > > P(head) for fair coin= 4/5* 1/2 = 2/5 > > > > > > the probability at any instant that the tossed coin is a head is 3/5 > > > > 17/80 is the probability to get head at all the six times. > > > > the soln. for this problem will be 3/5 > > > > On Mon, Aug 8, 2011 at 12:45 AM, aseem garg <ase.as...@gmail.com> wrote: > > > >> If the coin is unbiased then probability of heads: 1/2 irrespective of > >> whether it is first time or nth time. So answer should be 3/5. > >> Aseem > >> > >> > >> > >> On Mon, Aug 8, 2011 at 12:39 AM, saurabh chhabra > >> <saurabh131...@gmail.com>wrote: > >> > >>> Even u dont get why u people are gettin 17/80...the probability that > >>> it will be a head 6th time will be same as the frst time...so it shud > >>> be 3/5... > >>> > >>> On Aug 7, 11:05 pm, Kunal Yadav <kunalyada...@gmail.com> wrote: > >>> > @algo: We can get head in two cases:- > >>> > > >>> > 1.) coin is biases > >>> > 2.) coin is not biased > >>> > > >>> > P(head) for biased= 1/5 *1*1*1*1*1*1= 1/5 > >>> > P(head) for unbiased= 4/5*(1/2)^6 > >>> > hence combined probability is what nitish has already mentioned. Hope > >>> you > >>> > get the point. > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > On Sun, Aug 7, 2011 at 11:29 PM, Algo Lover <algolear...@gmail.com> > >>> wrote: > >>> > > Can anyone explain the approach how to solve this . > >>> > > I think all tosses are independent so it should be 3/5. why is this > >>> in- > >>> > > correct > >>> > > >>> > > On Aug 7, 10:55 pm, saurabh chhabra <saurabh131...@gmail.com> > wrote: > >>> > > > sry...its wrong > >>> > > >>> > > > On Aug 7, 10:34 pm, Algo Lover <algolear...@gmail.com> wrote: > >>> > > >>> > > > > A bag contains 5 coins. Four of them are fair and one has heads > >>> > > > > on > >>> > > > > both sides. You randomly pulled one coin from the bag and > tossed > >>> it 5 > >>> > > > > times, heads turned up all five times. What is the probability > >>> that > >>> > > > > you toss next time, heads turns up. (All this time you don't > know > >>> you > >>> > > > > were tossing a fair coin or not). > >>> > > >>> > > -- > >>> > > You received this message because you are subscribed to the Google > >>> Groups > >>> > > "Algorithm Geeks" group. > >>> > > To post to this group, send email to algogeeks@googlegroups.com. > >>> > > To unsubscribe from this group, send email to > >>> > > algogeeks+unsubscr...@googlegroups.com. > >>> > > For more options, visit this group at > >>> > >http://groups.google.com/group/algogeeks?hl=en. > >>> > > >>> > -- > >>> > Regards > >>> > Kunal Yadav > >>> > (http://algoritmus.in/) > >>> > >>> -- > >>> You received this message because you are subscribed to the Google > Groups > >>> "Algorithm Geeks" group. > >>> To post to this group, send email to algogeeks@googlegroups.com. > >>> To unsubscribe from this group, send email to > >>> algogeeks+unsubscr...@googlegroups.com. > >>> For more options, visit this group at > >>> http://groups.google.com/group/algogeeks?hl=en. > >>> > >>> > >> -- > >> You received this message because you are subscribed to the Google > Groups > >> "Algorithm Geeks" group. > >> To post to this group, send email to algogeeks@googlegroups.com. > >> To unsubscribe from this group, send email to > >> algogeeks+unsubscr...@googlegroups.com. > >> For more options, visit this group at > >> http://groups.google.com/group/algogeeks?hl=en. > >> > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Algorithm Geeks" group. > > To post to this group, send email to algogeeks@googlegroups.com. > > To unsubscribe from this group, send email to > > algogeeks+unsubscr...@googlegroups.com. > > For more options, visit this group at > > http://groups.google.com/group/algogeeks?hl=en. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- Shuaib http://www.bytehood.com http://twitter.com/ShuaibKhan -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
