if [a+1],[a+1]x^2,[a+1]x^4___ is a geometric sequence write down exptressions for the n th and 9 th terms
if [a+1],[a+1]x^2,[a+1]x^4___ is a geometric sequence write down exptressions for the n th and 9 th terms
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a+1/a+1-1=a+1/a