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In a simultaneous thrown of a pair of di...

In a simultaneous thrown of a pair of dice, find the probability of getting: (i)8 as the sum  (ii)a doublet of prime number    (iii)a doublet of odd number

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(i) `1/12`
(ii) `1/2`
(iii) `5/18`
(iv) `5/18`
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