document.write( "Question 1203795: the second term of an arithmetic is 12 and the 6th term is 40. What is the common difference? \n" ); document.write( "

Algebra.Com's Answer #839649 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "Between the 2nd and the 6th terms of an AP, there are  6-2 = 4 gaps of equal length on the number line.\r\n" );
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document.write( "Each gap is   =  = 7 units long.\r\n" );
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document.write( "The size of each gap is exactly the common difference value.\r\n" );
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document.write( "So, the common difference of this AP is  7  units.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Simple, short and elegant reasoning.\r
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\n" ); document.write( "\n" ); document.write( "It makes sense to memorize this mantra an use it
\n" ); document.write( "in many other similar problems to provide quick solutions.\r
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