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b = 2
Un = 298
Un = a + (n-1)b
Un = 102 + (n-1)2
Un = 102 + 2n - 2
Un = 100 + 2n
298 = 100 + 2n
298 - 100 = 2n
198 = 2n
198 : 2 = n
99 = n
Sn = n/2 (a+Un)
S99 = 99/2 (102 + 298)
S99 = 49,5 (400)
S99 = 19.800