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  • 24-06-2019
  • Mathematics
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Find S16 for 1 + 7 + 13 + 19 +

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konrad509
konrad509 konrad509
  • 24-06-2019

[tex]S_n=\dfrac{a_1+a_n}{2}\cdot n\\n=16\\a_1=1\\a_{16}=?\\\\a_n=a_1+(n-1)\cdot d\\d=6\\a_{16}=1+(16-1)\cdot6=1+90=91\\\\S_{16}=\dfrac{1+91}{2}\cdot6=46\cdot6=276[/tex]

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