document.write( "Question 1179193: 13. Please help with this math problem \r
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Algebra.Com's Answer #808723 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "\"11\", \"7\", \"3\", \"-1\",\"-5\",...\r
\n" ); document.write( "\n" ); document.write( "\"7-11=-4\"
\n" ); document.write( "\"3-7=-4\"\r
\n" ); document.write( "\n" ); document.write( "common difference is \"-4\"\r
\n" ); document.write( "\n" ); document.write( "\"a%5B1%5D=11\"\r
\n" ); document.write( "\n" ); document.write( "your formula is:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=11-4%28n-1%29\"
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