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-4 is the first negative term. The progression is 24,20,16,12,8,4,0,-4,...
Progression.
Divide any term, except the first, by the term before it.
The common ratio is the ratio of the nth term (n > 1) to the (n-1)th term. For the progression to be geometric, this ratio must be a non-zero constant.
the answer for the above question is -2187