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b = 3
Un (trkhr) = 498
Un = a + (n-1)b
Un = 402 + (n-1)3
Un = 402 + 3n - 3
Un = 399 + 3n
498 = 399 + 3n
498 - 399 = 3n
99 = 3n
99 : 3 = n
33 = n
Sn = n/2 (a+Un)
S33 = 33/2 (402+498)
S33 = 16,5 (900)
s33 = 14850