Answer+Step-by-step explanation:
First term a₁ = -1215 (Given)
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Second term a₂ :
[tex]a_{2}=a_{2-1}\times \frac{1}{3} =a_{1}\times \frac{1}{3} =\frac{-1215}{3} =-405[/tex]
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Third term a₃ :
[tex]a_{3}=a_{3-1}\times \frac{1}{3} =a_{2}\times \frac{1}{3} =\frac{-405}{3} =-135[/tex]
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Fourth term a₄ :
[tex]a_{4}=a_{4-1}\times \frac{1}{3} =a_{3}\times \frac{1}{3} =\frac{-135}{3} =-45[/tex]
