Question

4 coined ars tossed find the probablity of getting atleast two tails

Answer 1

P(H, H, H, H) = (1/2)^4 =1/16
P(T, H, H, H) = 4!/3! * (1/2)^4 = 4/16

P(T>2)= 1 - (1/16 + 4/16) = 11/16