Example of arithmetic series: 2 + 4 + 6 + 8 + 10..., 4 + 8 + 12 + 16 + 20..., Example of geometric sequence: 2, 4, 8, 16..., 3, 9, 27, 81..., Correct answer: a1=2 d=3 a4=11, a1=2 r=2 a5 = 32, Wrong answer: a1=1 d=4 a5= 9, a1=3 d=2 a3= 13, Has common difference: Arithmetic sequence, Arithmetic series, Has common ratio: Geometric sequence, Geometric series, Numbers that are part of a1=2 d=4: 6, 10, 14, Numbers that are part of a1=1 d=4: 5, 9, 13,

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