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