Question 442499
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
{{{a[n] = a[1]*r^(n-1)}}}
{{{a[2] = a[1]*r = 10 }}}  {{{a[1]}}} = 10/r
{{{a[5] = a[1]*r^4 = 7290}}}
            10/r * r^4 = 7290
                  10r^3 = 7290
                      r^3 = 729
                       r = 9  and {{{a[1]}}} = 10/r = 10/9
{{{a[n] = (10/9)*9^(n-1)}}}

CHECKING our Answer***
{{{a[5] = (10/9)*9^(4) = 10/9*6561 = 7290}}}




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