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06-07-2016
Mathematics

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find the 40th term of the arithmetic sequence. -1, -5, -9, -13, -17,

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06-07-2016

Hello,

[tex]r=-4\\ u_{1}=-1\\ u_{2}=-1+r\\ u_{3}=-1+2r\\\\ u_{40}=-1+39r=-1+39*(-4)=-1-156=-157\\[/tex]

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