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15 per 2 (74)
hasilnya 555
b= 3
n= 15
dit : S15 ?
jwb ..
S15 = n/2 (2.a+(n-1)b
S15 = 15/2 (2x16+(15-1)3
S15 = 15/2 (2x16+(14)3
S15 = 15/2 (32+42)
S15 = 15/2 (74)
S15 = 555