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pada barisan aritmatika terdapat b (beda) yaitu nilai U2-U1 = U3-U2 = U4-U3 = Un- Un-1
dan pada barisan itu
U2 - U1 = -19 - (-21) = 2
U3 - U2 = -17 - (-19) = 2
U4 - U3 = -13 - (-17) = 4 berbeda hasilnya
Jadi, -21,-19,-17,-13 BUKAN BARISAN ARITMATIKA