document.write( "Question 855044: What is Sn of the geometric series with a1=-81, r=-2/3, and n=5?\r
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document.write( "A)26
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document.write( "B) -39
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document.write( "C) -55
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document.write( "D)211 \n" );
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Algebra.Com's Answer #515046 by richwmiller(17219)![]() ![]() You can put this solution on YOUR website! S=a*(1 - r^n)/(1 - r) \n" ); document.write( "S=-81*(1 - (-2/3)^5)/(1 - (-2/3)) \n" ); document.write( "S = -55 \n" ); document.write( "C) -55 \n" ); document.write( " |