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u6= 51
beda (b) = 51 -30/6-3
=21/3
=7
suku pertama (a)
= 30 -7 -7
=16
suku ke 15
un = a + (n-1)b
u15 = 16 + (15-1)7
=16 + 98
=114
jumlah 15 suku pertma
Sn =n/2 (a +un)
= 15/2 (16 +144)
=7,5 . 130
=975 D