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suku pertama/a= 105
suku terakhir = 295
beda= 5
Un = a+(n-1)b
295 =105+(n-1)5
295=105+5n-5
295=100+5n
195=5n
195:5=n
39=n
Sn=n:2x(a+un)
S39=39:2x(105+295)
s39=39:2x400
s39=39x200
s39=7800