Question 1026416
The sample space when tossing 3 coins is [HHH, HHT, HTH, HTT, THH, THT, TTH, TTT] 

n(S) = 8

at least two tails A= [ HTT,THT, TTH, TTT] 

n(A) = 4

P(A) = n(A)/n(S)

=4/8

=1/2