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b = 5
Un = 495
Un = a + (n-1)b
Un = 105 + (n-1)5
Un = 105 + 5n - 5
Un = 100 + 5n
maka n adalah
Un = 100 + 5n
495 = 100 + 5n
5n = 495-100 = 395
n = 395/5 = 79
maka
Sn = n/2 (a + Un)
S79 = 79/2 (105 + 495)
S79 = 39,5 (600)
S79 = 23.700