document.write( "Question 877370: 77 61 45 29 __ ? \n" ); document.write( "
Algebra.Com's Answer #804086 by CubeyThePenguin(3113)\"\" \"About 
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77 - 61 = 16
\n" ); document.write( "61 - 45 = 16
\n" ); document.write( "45 - 29 = 16 ...\r
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\n" ); document.write( "\n" ); document.write( "next term: 29 - 16 = 13
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