document.write( "Question 725749: A certain arithmetic sequence has this explicit formula for the nth term:\r \n" );
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document.write( "an = 11 + (n - 1)(4)\r \n" );
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document.write( "The same sequence has this recursive formula:\r \n" );
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document.write( "an = an - 1 + _____\r \n" );
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document.write( "What number belongs in the blank space in the recursive formula? \n" );
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