Question 1202407
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The common ratio is  {{{-2/3}}}.   It is absolutely clear from the expression.


The first term is, OBVIOUSLY, {{{9*(-2/3)}}} = (-2)*3 = -6.


It is clear from the formula   {{{a[n]}}} = {{{a[1]*(-2/3)^(n-1)}}}  for the n-th term.
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Solved.


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