document.write( "Question 1000369: nth element of sequences -1,2,-4,8 is \n" ); document.write( "
Algebra.Com's Answer #617845 by josgarithmetic(39618)\"\" \"About 
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Same question asked about three times.\r
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\n" ); document.write( "\n" ); document.write( "Let n be the index.
\n" ); document.write( "Sign is alternating as \"%28-1%29%5En\".
\n" ); document.write( "Basic size of terms is according to \"2%5E%28n-1%29\".
\n" ); document.write( "Put them together.
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