Definition
A geometric progression is a sequence where each next term is obtained by multiplying by the same number q=0 (the common ratio).
Recursively: bn+1=bn⋅q, b1=0.
If ∣q∣>1 the absolute values often grow; if 0<∣q∣<1 they tend to zero. The sign alternates if q<0.
The ratio of neighbours is constant: bnbn+1=q (where the denominator is nonzero)
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