Arithmetic: has a common difference, 2,4,6,8,10, 3,15,27,39,51, an=a(n-1)+2; a1= -4, f(n)=f(n-1) - 5; f(1)=7, , , , f(x) = 2x-7, , Geometric: has a common ratio, 2,4,8,16,32, 4,12,36,108,324, f(n)=f(n-1)*-2; f(1)=9, an= 6a(n-1); a1=-3, , , , y = 7(2)x-1, ,

Arithmetic or Geometric

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