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selisih = 29-8 = 21
selisih setiap suku = 21/7 = 3
suku ke 6 = 8+(3 x 3) = 8+9 = 17
U10= a + 9b = 29
Eliminasi aja = 7b = 21 maka b = 3 dan a= 2
U6 = a + 5 b = 2 + 5(3) = 2 + 15 = 17