document.write( "Question 1151208: the sum of first n term of an A.P is given as n2 -3n.write down the 4th term and the
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Algebra.Com's Answer #772866 by ikleyn(52806) $\"\"$ $\"About$

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document.write( "The 4-th term = sum of the first 4 terms  MINUS  sum of the first 3 terms = \r\n" );
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document.write( "              = (4^2-3*4) - (3^2-3*3) = (16-12) - (9-9) = 4 - 0 = 4.    ANSWER\r\n" );
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document.write( "The n-th term = sum of the first \"n\" terms  MINUS  sum of the first (n-1) terms = \r\n" );
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document.write( "             = (n^2-3*n) - ((n-1)^2-3*(n-1)).\r\n" );
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document.write( "Simplify to get the answer.\r\n" );
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