A coin is tossed three times then find the probability of getting head on middle coin.


Since a coin is tossed three times

Sample space = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
∴ n(S) = 8

Let A = Event that the head on the middle coin.

A = {HHH, HHT, THH, THT}

∴ n(A) = 4

P(A)
=
n(A)
=
4
=
1


n(S)

8

2

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