On Mon, Aug 8, 2011 at 12:47 AM, aseem garg <ase.as...@gmail.com> wrote:
> Think it like this. I have tossed a coin 5 times and it showed heads all > the times. What is the probabilty of it shoing a HEADS now? > Aseem > Well you are thinking about it the wrong way. Question asks that what is the probability that heads will show up the first five times, plus a sixth time. Not just the sixth time. The first five times head showing up is part of the question. > > > > On Mon, Aug 8, 2011 at 1:12 AM, Shuaib Khan <aries.shu...@gmail.com>wrote: > >> >> >> 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. >> > > -- > 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. 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