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Verified answer
U1 = 3x, U2 = 3+x, U3 = 6U2-U1 = U3-U2
(3+x)-(3x) = 6-(3+x)
3+x-3x = 6-3-x
3-2x = 3-x
x = 0 (D)
karna jika x bukan 0, maka barisan tersebut bukan menjadi barisan aritmatika