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
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. 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