document.write( "Question 443823: Write each series in summation notation
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Algebra.Com's Answer #306065 by tinbar(133)\"\" \"About 
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(Sigma):(-2)^n, from n = 1 up to infinity. \r
\n" ); document.write( "\n" ); document.write( "if your question requires you start from n = 0 and go to infinity, then the answer is: (Sigma):(-2)^(n+1)
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