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Consider the function y = an

If a < -1 it oscillates between negative and positive values, with the oscillations increasing.

If a = -1, it oscillates between -1 and 1.

If -1 < a < 0 it oscillates between negative and positive values, with the oscillations deceasing.

if 0 < a < 1, it is decreasing.

If a = 1, it is 1 for all n

If a > 1, it is increasing.

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