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Find S16 for 1 + 7 + 13 + 19 +
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Find S16 for 1 + 7 + 13 + 19 +

User RussHWolf
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S_n=(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)=(1+91)/(2)\cdot6=46\cdot6=276

User Seephor
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