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Kelas IX
b = 7
Un = 196
a = 105
Un = a + (n-1)b
196 = 105 + 7n - 7
n = 14
Sn = n/2 (a+Un)
S14 = 14/2 (105+196)
S14 = 7 x 301
S14 = 2.107