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b = 5
Un (terakhir) = 295
Un = a + (n-1)b
Un = 105 + (n-1)5
Un = 105 + 5n - 5
Un = 5n + 100
295 = 5n + 100
295 - 100 = 5n
195 = 5n
195 : 5 = n
39 = n
Sn = n/2 (a+Un)
S39 = 39/2 (105 + 295)
S39 = 19,5 (400)
S39 = 7.800