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There unbiased dice are thrown at a time...

There unbiased dice are thrown at a time . What is the probability that the number 1 appears at lest once? Given that the number on the first die is 3. What is the probability that the sum of the numbers on the three dice is odd?

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The correct Answer is:
`1 - ((5)/(6))^(3) ; (1)/(2)`
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