Question 442504
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi, Previously Posted
arithmetic sequence
12,9,6,3,...
  d = -3
{{{a[n]=a[1]+(n-1)*d}}}
{{{a[n]=12+(n-1)*(-3)}}}
{{{a[100]=12+(99)*(-3) = highlight(-285)}}}




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