Question:
Three unbiased coins are tossed. What is the probability of getting at most two heads?
[A].
Three unbiased coins are tossed. What is the probability of getting at most two heads?
[A].
3 |
4 |
[B].
1 |
4 |
[C].
3 |
8 |
[D].
7 |
8 |
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 | . |
n(S) | 8 |