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.
