A coin is tossed twice find the probability of getting (a)one head (b) two tails
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sample space =£(h, h), (h, t ),(t, h), (t, t)
P(a)
where a is one head
P(a)=3/4
P(b)
where b is two tails
P(b)=1/4
P(a)
where a is one head
P(a)=3/4
P(b)
where b is two tails
P(b)=1/4
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