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3p, 3p+3, 3p+6, ..., 3p+120
u1 = a = 3p
beda = 3
S41 = 9102
41/2 (2a + 40b) = 9102
41/2 (6p + 120) = 9102
6p + 120 = 444
6p = 324
p = 54
Bilangan terbesar = 3p + 360 = 162 + 120 = 282