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134 x3 = 402
500/3 =166,66
166 x 3= 498
barisannya = 402, 405, ....498
a = 402
b=3
un = 498
un= a+(n-1)b
498 = 402 +(n-1)3
96 = 3n - 3
3n = 96+3
n = 99/3 = 33
S33 = 33/2 ( 402 + 498)
= 16,5(900)
= 14.850