document.write( "Question 65392: Find the sum of each geometric series described
\n" ); document.write( "1. asub1= 512 r=1/2 n=6
\n" ); document.write( "2. 3 + 6 + 12...+192
\n" ); document.write( "3. asub1= -2 asub5= -162 n=7
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Algebra.Com's Answer #46073 by venugopalramana(3286)\"\" \"About 
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Find the sum of each geometric series described
\n" ); document.write( "1. asub1= 512 r=1/2 n=6
\n" ); document.write( "SN=A1/(1-R)
\n" ); document.write( "=512/[1-1/2]= 1008
\n" ); document.write( "2. 3 + 6 + 12...+192
\n" ); document.write( "A1=3.....R=6/3=2.....AN=192
\n" ); document.write( "AN = A1*R^(N-1)
\n" ); document.write( "192=3*(2)^(N-1)
\n" ); document.write( "2^(N-1)=192/3=64=2^6
\n" ); document.write( "N-1=6
\n" ); document.write( "N=7
\n" ); document.write( "SN = 3[2^7-1]/(2-1)=381\r
\n" ); document.write( "\n" ); document.write( "3. asub1= -2 asub5= -162 n=7
\n" ); document.write( "A5=A1*R^(5-1)
\n" ); document.write( "-162=-2*R^4
\n" ); document.write( "R^4=162/2=81=3^4
\n" ); document.write( "R=3
\n" ); document.write( "S7 = -2[3^7-1]/(3-1)=-2186\r
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