Special integer sequences
1.7
A sequence of the form a, a+d, a+2d, a+3d, … is called an arithmetic
progression.
A geometric progression is a sequence of the form a, ar, ar2, ar3, ar4,...
Examples:
20, 25, 30, 35, 40, …
--- arithmetic progression
3, 6, 12, 24, 48, ...
--- geometric progression
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