![$S_{20}=\frac{20}{2} [2a_{1}+(20-1)\cdot 4]$](/tpl/images/0687/9334/ca2f3.png)
![$880=10[2a_{1}+(19)\cdot 4]$](/tpl/images/0687/9334/f3aee.png)
![$880=10[2a_{1}+76]$](/tpl/images/0687/9334/2b057.png)
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