Question: 45. Let n be a positive integer. A random sample of four elements is taken from the set $ 0, 1, 2, . . .

45. Let n be a positive integer. A random sample of four elements is taken from the set $ 0, 1, 2, . . . , n% , one at a time and with replacement. What is the probability that the sum of the first two elements is equal to the sum of the last two elements?

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