Classify the following as either arithmetic or geometric progressions (or some combination of both). State the starting value and common difference/factor in each case.

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a. {10, 14, 18, 22, ..., 50} b. {-1, 1,-1, 1,...} c. nth term given by xn = 0.2 x 4" for n = 1,..., 10 d. nth terms given by xn 2" - 0.1n for n = = 1,2,.... e. {2, 5, 9, 15, ..., 16,413}