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I can appreciate that abstract sequences can have negative values.
Hordhac
Casharkani wuxuu ku saabsan yahay taxanaha (sequences) oo aan la taaban karin, gaar ahaan sida ay u yeelan karaan qiimayaal taban (negative values). Waa inaad hore u garanaysaa sida loo aqoonsado taxanaha arithmetic (linear) iyo farqiga guud (common difference) ee u dhexeeya xubnaha.
Muuji qoraalka
When you move away from physical representations of sequences, you can think abstractly.
You can consider what happens if there was not a first term.
The sequence could extend forward and backwards.
You can generate previous terms using the inverse of the term-to-term rule.
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