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Di k = Suku pertama = 201
beda = 3
Un = 399
Un = a + (n-1 ) b
399 = 201 + (n-1)3
399 = 201 + 3n - 3
399 = 198 + 3n
3n = 399 - 198
3n = 201
n = 67
Sn = (U1+Un)
S67 = (201 + 399)
= x 600
= 20.100
semoga membantu ^^