SOLUTION: If the 2nd term of a G.P is 6 and the 4th term is 54,find the Nth term

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Question 800100: If the 2nd term of a G.P is 6 and the 4th term is 54,find the Nth term
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Tn = a+(n-1)d
6=a+(2-1)d
6=a+d
54=a+(4-1)d
54=a+3d
a+d=6
a+3d=54
subtract
-2d=-48
d=24
if d=24
a=-18

Tn=a+(n-1)d
Tn = -18+(n-1)24
=-18+24n-24
=24n-42