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Three unbiased coins are tossed. What is the probability of getting at most two heads?
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Answer: Option D
Explanation:
Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}
Let E = event of getting at most two heads.
Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}.
 P(E) = |
n(E) |
= |
7 |
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| n(S) |
8 |
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Sundar said:
(Fri, Aug 20, 2010 01:01:14 AM)
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Hi Guys,
At most two heads means "Total number of HEADs can be 0 - 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! |
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Malarvizhi said:
(Sun, Oct 31, 2010 05:14:16 AM)
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| How did say n(s) is 8. |
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Sundar said:
(Sat, Nov 20, 2010 08:41:01 AM)
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@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. |
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Abhijit said:
(Fri, Dec 3, 2010 04:24:32 AM)
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total no of probabilities= 2^3 =8
for 2/1/0 heads probability is =7(only 1 left HHH) |
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Dharini said:
(Sun, Dec 19, 2010 12:26:40 PM)
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| I cant follow what abhijit said why it is 2 power 3? |
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Murugesh said:
(Sat, Jan 1, 2011 11:05:09 AM)
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@dharini...
2---> H & T
3---> total no of coins.
so 2^3. |
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Dinesh said:
(Tue, Jan 4, 2011 08:07:40 AM)
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Got it murugesh
thanks.. |
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Sathya said:
(Thu, Mar 24, 2011 07:18:45 AM)
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| WHAT IS UNBIASED COINS |
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Sathish said:
(Sat, Apr 30, 2011 07:04:48 AM)
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| Thank u sundar |
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Sara said:
(Mon, May 23, 2011 09:21:00 AM)
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| Won't it be 3 out of 8? |
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Puttz said:
(Thu, Jun 9, 2011 02:58:23 PM)
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| Unbiased coins means a coin having head and tail whereas a biased coin means having two heads or two tails respectively. |
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Durgaprasad said:
(Tue, Aug 9, 2011 11:18:56 AM)
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| Thanks sundar. Superb explanation. |
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Kruvy said:
(Wed, Sep 28, 2011 03:31:09 PM)
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| @Sundar , I like the way you explained. thanks mate. |
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Swetha said:
(Sat, Nov 5, 2011 11:39:27 AM)
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| Very clear explanation sundar..Thank you! |
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Uday said:
(Sat, Nov 12, 2011 10:15:27 PM)
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| How we can do with this ^ symbol ? |
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Arpan said:
(Sat, Dec 3, 2011 12:47:36 AM)
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| 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. |
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Saurabh Patel said:
(Fri, Feb 10, 2012 08:34:40 PM)
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| If the leatter of the word LUCKNOW are randomly arrenged, find the proabibility of always having the word NOW. |
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