Three unbased coins are tossed. the probability of getting at most one head two tail is ?  Choose the correct choice:
A) 1/2
B) 7/8
C) 3/4
D) 3/8
E) 2/3
S={TTT,TTH,THT,HTT,THH,HTH,HHT,HHH}   E be the event of getting at least two head is {TTH,THT,HTT}   P(E)=n(E)/n(S)=3/8   Answer(3/8)
<result>D</result>
Three unbased coins are tossed. the probability of getting at most one head two tail is ?