Three unbiased coins are tossed. What is the probability of getting at most two heads?

  • 13/4
  • 21/4
  • 33/8
  • 47/8
Answer:- 1
Explanation:-

Solution:
Getting at most Two heads means 0 to 2 but not more than 2.
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)n(S)=78

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "
Solution:
Getting at most Two heads means 0 to 2 but not more than 2.
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)n(S)=78
", "dateCreated": "7/24/2019 10:09:12 AM" } }
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