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10n+ 1 = 11
11 x 8,2 = 90,2
90,2 - 78 = 12,2
Jadi nilai anak ke 11 adalah 12,2
8,2 x 11 = 78 + a
90,2 = 78 + a
a = 90,2 - 78
a = 12,2
nilai anak ke 11 = 12,2