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Un = Un-1 + Un-2 + Un-3
U4 = U3 + U2 + U1 = 3 + 2 + 1 = 6
U5 = 6+3+2= 11
U6 = 11+6+3 = 20
U7 = 20+11+6= 37
U8 = 37+20+11=68
Jadi, urutan angka yang hilang adalah 37.