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a = -100
b = -80-(-100) = 20
Un = -100 +20n -20
Un = 20n - 120
e) 5, 6½, 8, 9½, ...
a = 5
b = 6½-5 = 1½
Un = 5 + 1½n - 1½
Un = 1½n + 3½