document.write( "Question 1154461: If an= 27 , a1= -12 and d=3 find n \n" ); document.write( "

Algebra.Com's Answer #776886 by ikleyn(52800) $\"\"$ $\"About$

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document.write( "In arithmetic progression\r\n" );
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document.write( "     =  + (n-1)*d.\r\n" );
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document.write( "In your case, it takes the form\r\n" );
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document.write( "    27 = -12 + (n-1)*3.\r\n" );
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document.write( "From this equation\r\n" );
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document.write( "    n-1 =  =  = 13.\r\n" );
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document.write( "Hence,  n = 13 + 1 = 14.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "For introductory lessons on arithmetic progressions see \r
\n" ); document.write( "\n" ); document.write( "    - Arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "    - The proofs of the formulas for arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Problems on arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Arithmetic progressions\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-II
\n" ); document.write( "https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "into your archive and use when it is needed.\r
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