Three unbased coins are tossed. the probability of getting at most three head is ?  Choose one:
A) 1/2 B) 7/8 C) 3/4 D) 1/5 E) 1/8
S={TTT,TTH,THT,HTT,THH,HTH,HHT,HHH}   1/8 be the event of getting at least two head is {HHH}   P(1/8)=n(1/8)/n(S)=1/8   Answer(1/8)
<result>E</result>
Three unbased coins are tossed. the probability of getting at most three head is ?