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When two dice are thrown, what is the pr...

When two dice are thrown, what is the probability that :
Sum of numbers is an odd no. ?

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Desired sums of the numbers are 3, 5, 7, 9 and 11
n (S) = 2 + 4 + 6 + 4 + 2= 18
`therefore`Reqd. probability
`18/36=1/21
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