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Un = 175
a = 35
b = 7
Un = a +(n-1)b
175 = 35 + 7n -7
175 = 28 + 7n
147 = 7n
n = 21
S21 = 21/2 (2(35) + 20(7))
= 21/2 (70 + 140)
= 21 (105)
= 2.205 (D)
Semua itu kita tambahkan.Hasilnya adalah 2339