Question 1157939
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The second and fifth term of a GP are 3/2 and 1/12, respectively. What is the first term?
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{{{system(T[2]=3/2,and,T[5]=1/12)}}}



common ratio unknown but can be found.  Then  {{{T[2]r^3=T[5]}}}.   Maybe you can find this r, and do the rest.


Do the substitutions and then the algebra steps, and you may find {{{r=root(3,12)/6}}}.