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deret geometri
a = 105
un = 295
b = 5
un=a+(n-1)b
295 = 105 + (n-1)5
(295-105) / 5 = n-1
38 = n-1
n = 39
sn = n/2 (a+un)
s39 = 39/2 (105+295)
s39 = 7800
2.
deret aritmatika
a = 6
r = u2/a = 6/2 = 1/3
sn = a(1 - r^n) / (r-1)
s8 = 6(1 - (1/3)^8) / (1-1/3)
s8 = 18 (1 - 1/6561) = 118080/6561 = 17 6543/6561