Three unbased coins are tossed. the probability of getting at least two head is ?
Pick:  A) 1/4  B) 1/2  C) 3/4  D) 2/3  E) 2/5
S={TTT,TTH,THT,HTT,THH,HTH,HHT,HHH}   E be the event of getting at least two head is {THH,HTH,HHT,HHH}   P(E)=n(E)/n(S)=4/8=1/2   Answer(1/2)
<result>B</result>
Three unbased coins are tossed. the probability of getting at least two head is ?