23. Two fair dice are tossed. Both numbers are added up. Show that the probability of getting a sum of seven is . A pair of dice is tossed 100 times and the sum is observed on each occasion. What is the probability of getting more than 25 occasions where the sum is seven? How many tosses would be required in order that the probability of getting at least one seven is 0.9 or more?

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A: Please refer to the image below

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