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

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