Question #f3cab

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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 $=1/8+1/8+1/8 =3/8$