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3, -9, 27, -81,..... common difference/ratiod = 3r = 9r = -3 d = 12

Sagot :

To find the common ratio we divide the terms by the previous one. In this case we have:

[tex]-\frac{9}{3}=-3[/tex][tex]\frac{27}{-9}=-3[/tex][tex]-\frac{81}{27}=-3[/tex]

Therefore, the common ratio is r=-3.

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