document.write( "Question 257095: I need your help with this geometric series
\n" ); document.write( " a(subscript 1)=4
\n" ); document.write( "r=3
\n" ); document.write( "S (subscript n)=484
\n" ); document.write( "n=?
\n" ); document.write( "

Algebra.Com's Answer #189073 by drk(1908)\"\" \"About 
You can put this solution on YOUR website!
From the given information, the formula for the nth term is
\n" ); document.write( "\"T%28n%29+=+4%2A3%5E%28n-1%29\"
\n" ); document.write( "create a table to get
\n" ); document.write( "T(1) = 4*3^0 = 4
\n" ); document.write( "T(2) = 4*3^1 = 12
\n" ); document.write( "T(3) = 4*3^2 = 36
\n" ); document.write( "T(4) = 4*3^3 = 108
\n" ); document.write( "T(5) = 4*3^4 = 324
\n" ); document.write( "If we add the first 5 terms we get 484.
\n" ); document.write( "n = 5
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