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Verified answer
》》》Bab Barisan dan Deret《《《20 + 23 + 26 + 29 + ....
Diketahui:
a=20
b=3
n=15
Sn=n/2 (2a + (n-1) b )
S15=15/2 (2(20) + (15-1) 3)
S15=7,5 (40 + 42)
S15=7,5 (82)
S15=615 Kursi ( A )