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-162 -222
-168 -228
-174 -234
-180 -240
-186 -246
-192
-198
-204
-210
ini jawabannya tapi aku nggak tahu caranya maaf yaa!
un = 156 +(n-1) × 6
246 = 156 + 6n - 6
246 = 150 + 6n
6n = 96
n = 96/6
n = 16
sn = n/2 × (a+un)
s16 = 16/2 ( 156 + 246 )
s16= 8 (402)
s16 = 3216
jadi jumlah bilangnya adalah 3216