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a. U100 = 2*100 + 1 - 2 + 1/2 (99) (98) 2
= 199 + 99 * 98
= 9901
b. U100 = 2*100 + 2 - 2 + 1/2 (99) (98) 2
= 200 + 99 * 98
= 9902