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maaf kalau salah
angka trakir yg bs dibagi 3&4 = 444 = Un
b= kpk dr 3&4 = 12
deret aritmatik
Un = a + (n-1)b
444 = 204 + (n-1)12
240 = 12n -12
252 = 12n
252/12 = n
21 = n
Sn = n/2 ( a+Un)
S21 = 21/2 ( 204 + 444)
S21 = 21/2(648)= 6.804 (B)