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a. Sum of x = -1 + 0 + 1 + 4 = 4

b. Sum of x^2 = 1 + 0 + 1 + 16 = 18

c. Sum of (x-1) = -2 - 1 + 0 + 3 = 0

d. Sum of (x-1)^2 = 4 + 1 + 0 + 9 = 14.

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