Three unbiased coins are tossed. What is the probability of getting at

Three unbiased coins are tossed. What is the probability of getting at most two heads?(a) (frac { 7 }{ 8 })(b) (frac { 3 }{ 8 })(c) (frac { 1 }{ 4 })(d) (frac { 3 }{ 7 })

Answer

Answer: (a) (frac { 7 }{ 8 })

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