Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?  Options
A) 1/5	B) 1/7	C) 1/8	D) 1/2	E) 1/10
Total cases are = 2^3=8   favoured cases =[TTH,THT,HTT,TTT]=4   Probability = 4/8=1/2   ANSWER 1/2
<result>D</result>
Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?