Question: I need help with this problem, not exactly sure. I posted the picture below. #4: Determine whether each of the following is a valid probability

I need help with this problem, not exactly sure. I posted the picture below.

#4: Determine whether each of the following is a valid probability distribution. If not, identify the requirement that is not satised. 5) Two 6sided dice, with sides numbered 1 through 6, are rolled, and the top numbers are observed. What is the probability that the sum of the two top numbers on the dice will be 7

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