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a = 20
u13= a + 12b = 116
20 + 12b = 116
12b =96
b = 8 ...>(beda baru)
maka barisan itu
20, 28, 36....... 108, 116
Jumlah :
S13 = 1/2n ( a + u13)
= 1/2 x 13 ( 20 + 116)
= 6,5 ( 136)
=884