Question 1104821
{{{70-2(n-1)}}}, the general term for arithmetic sequence



{{{70-2(n-1)=6}}}
Solve for n, the number of rows


{{{70-2n+2=6}}}
{{{72-6=2n}}}
{{{2n=66}}}
{{{n=33}}}



Total of poles in ALL the rows?  

{{{(33/2)(70+6)}}}-----based on formula for sum of arithmetic sequence
{{{33(35+3)}}}
{{{highlight(1254)}}}