Question 1162534
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This recursive equation is


    {{{a[n+1]}}} = {{{a[n]}}} + (700-150-400),


or, equivalently, 


    {{{a[n+1]}}} = {{{a[n]}}} + 150.


The formula works for n >= 1 and predicts the amount at the account n+1 months after start.


Notice that  {{{a[1]}}} = 1900  (given).
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