Question 448454
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Hi 
Aritmetic Series {5,8,11,14,17, {{{highlight(20)}}}...}
   d = 3, term following 17(the 6th term) would be 17 + 3 = 20

{{{a[n]=a[1]+(n-1)*d}}}
{{{a[6]=5+(5)*3 = 20}}}