Three unbiased coins are tossed. What is the probability of getting at least 2 heads?  Choose the correct choice from the following choices:  A) 1/4  B) 1/2  C) 1/3  D) 1/8  E) 1/6
Here S={TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}   Let E=event of getting at least two heads = {THH, HTH, HHT, HHH}   P(E) = n(E)/n(S) = 4/8 = 1/2   Answer 1/2.
<result>B</result>
Three unbiased coins are tossed. What is the probability of getting at least 2 heads?