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what's predictable sequence of at least 4 numbers that is not arithmetic or geometric

Sagot :

naǫ
For example a sequence represented by the formula [tex]a_n=n^2[/tex].

[tex]a_1=1^2=1 \\ a_2=2^2=4 \\ a_3=3^2=9 \\ \\ a_2-a_1=4-1=3 \\ a_3-a_2=9-4=5 \\ \Downarrow \\ a_2-a_1 \not= a_3-a_2 \\ \hbox{not arithmetic} \\ \\ \frac{a_2}{a_1}=\frac{4}{1}=4 \\ \frac{a_3}{a_2}=\frac{9}{4}=2.25 \\ \Downarrow \\ \frac{a_2}{a_1} \not= \frac{a_3}{a_2} \\ \hbox{not geometric}[/tex]

The sequence is: 1, 4, 9, 16...
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