At most two heads means "Total number of HEADs can be 0 to 2".
So we cannot include HHH, because it contains 3 heads.
But we can include TTT, because ZERO head is accepted.
Therefore, the given answers is perfectively correct.
You may ask your doubts here if you have regarding this question?
Have a nice day!
Malarvizhi said:
(Sun, Oct 31, 2010 05:14:16 AM)
How did say n(s) is 8?
Sundar said:
(Sat, Nov 20, 2010 08:41:01 AM)
@Malarvizhi
Note: "At most two heads" --(means)--> Not more than two heads.
Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH} <--- (8 combinations)
Therefore, n(S) = 8.
Abhijit said:
(Fri, Dec 3, 2010 04:24:32 AM)
Total no of probabilities= 2^3 =8
for 2/1/0 heads probability is =7(only 1 left HHH)
Dharini said:
(Sun, Dec 19, 2010 12:26:40 PM)
I cant follow what abhijit said why it is 2 power 3?
Murugesh said:
(Sat, Jan 1, 2011 11:05:09 AM)
@dharini...
2---> H & T
3---> total no of coins.
so 2^3.
Dinesh said:
(Tue, Jan 4, 2011 08:07:40 AM)
Got it murugesh
thanks..
Sathya said:
(Thu, Mar 24, 2011 07:18:45 AM)
What is unbiased coins?
Sathish said:
(Sat, Apr 30, 2011 07:04:48 AM)
Thank you sundar.
Sara said:
(Mon, May 23, 2011 09:21:00 AM)
Won't it be 3 out of 8?
Puttz said:
(Thu, Jun 9, 2011 02:58:23 PM)
Unbiased coins means a coin having head and tail whereas a biased coin means having two heads or two tails respectively.
Durgaprasad said:
(Tue, Aug 9, 2011 11:18:56 AM)
Thanks sundar. Superb explanation.
Kruvy said:
(Wed, Sep 28, 2011 03:31:09 PM)
@Sundar , I like the way you explained. thanks mate.
Swetha said:
(Sat, Nov 5, 2011 11:39:27 AM)
Very clear explanation sundar..Thank you!
Uday said:
(Sat, Nov 12, 2011 10:15:27 PM)
How we can do with this ^ symbol ?
Arpan said:
(Sat, Dec 3, 2011 12:47:36 AM)
Abhijeet that's not the way to do this prob. You got it totally wrong. But your answer is matching. Have a look at Sundar's answer.
Saurabh Patel said:
(Fri, Feb 10, 2012 08:34:40 PM)
If the leatter of the word LUCKNOW are randomly arrenged, find the proabibility of always having the word NOW.
Manju said:
(Tue, Feb 28, 2012 02:32:19 PM)
How many times a man can tossing a coin so that the probability of atleast one head is more than 80%?
Sujit said:
(Fri, Nov 16, 2012 08:18:17 PM)
SOURAV
If NOW will be together all the time all the time then take "NOW" as one letter. Lucknow will be considered as 5 letters. Then you can get the answer easily.
Ravi said:
(Tue, Dec 25, 2012 11:06:16 AM)
You ask most two head but why you considered zero head?
P(E) =