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Write the sum without sigma notation and evaluate it

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Write the sum without sigma notation and evaluate it.
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a) -(1 - 2)2 -2(2 - 2)2 -3(3 - 2)2 = -4

b) -(1 - 2)2 + (2 - 2)2 - (3 - 2)2 = 2

c) -(1 - 2)2 + (2 - 2)2 - (3 - 2)2 = -2

d) (1 - 2)2 - (3 - 2)2 = -2

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