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  4. In a single throw of two dice, the probability of getting a total of 7 or 9 is

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Q. In a single throw of two dice, the probability of getting a total of $7$ or $9$ is

Probability - Part 2

Solution:

P (a total of 7 or 9)
= P (a total of 7) + P (a total of 9) $ = \frac{6}{36} + \frac{4}{36}$ .
(a total of 7 and a total of 9 cannot occur simultaneously)