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Three unbiased coins are tossed together...

Three unbiased coins are tossed together. Find the probability of getting:
(i)all heads
              (ii)   two heads
(iii)one head 
            (iv)   at least two heads

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`3` unbiased coins are tossed together
sample space `S`
`={HHH,HHT,HTH,THH,TTH,THT,HTT,TTT}`
no. of events, n(s)=`8`
...
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