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Answer 1 · 2017-02-24T10:09:53

#3/8#

Probability at least two head means =HHH or HHT or HTH or THH

Probability for {HHH}=# 1/2*1/2*1/2 = 1/8#

Probability for {HHT}=# 1/2*1/2*1/2 = 1/8#

Probability for {HTH}=# 1/2*1/2*1/2 = 1/8#

Probability for {THH}=# 1/2*1/2*1/2 = 1/8#

Probability at least two head occur #=1/8+1/8+1/8+1/8 =4/8 =1/2#

Probability at least two head occur consecutively is HHH, HHT or THH #=1/8+1/8+1/8 =3/8#