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a = 402, b = 3
Un = a + (n - 1)b
498 = 402 + (n - 1)3
498 = 402 + 3n - 3
498 = 399 + 3n
3n = 498 - 399
3n = 99
n= 33
Sn = 1/2 n (a + Un)
Sn= 1/2 x 33 x (402 + 498)
Sn= 16,5 x 900
Sn = 14.850