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a = 11, b = 16 - 11 = 5
n = 10
maka
Sn = (n/2)(2a + (n - 1)b)
= (10/2)(2(11) + (10 - 1)(5))
= (5)(22 + 45)
= 5(67)
= 335
Jawab : A
Terimakasih smeoga mebantu