If two coins are tossed then find the probability of the events. At least one tail turns up.

Since two coins are tossed

∴ Sample space = {HH, HT, TH, TT}

∴ n(S) = 4

Let A = Event of getting atleast one tail

∴ A = { HT, TH, TT }

∴ n(A) = 3

P(A) = n(A) = 3 n(S) 4