Question 614130
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi, 
What is the sum of the finite arithmetic series?
Knowing the 1st and nth Term:
{{{S[n]=(n(a[1]+a[n]))/2}}}
In general:
{{{S[n]=(n/2)(2*a[1]+ (n-1)d)}}}