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15 = a / 1 - 3/5
15 = a / 2/5
15 x 2/5 = a
6 = a
U1 = a = 6
15 = a : (1- 3/5)
15 = a : 2/5
a = 15 . 2/5
a = 6
jadi suku pertama (a) adalah 6