document.write( "Question 1206889: logs are stacked in a pile with 24 logs on the bottom row and 15 on the top row. there are 10 rows in all with each row having one more log than the one above it. how many logs are in the stack
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Algebra.Com's Answer #844688 by MathTherapy(10557)\"\" \"About 
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document.write( "logs are stacked in a pile with 24 logs on the bottom row and 15 on the top row. there are 10 rows in all with each row having one more log than the one above it. how many logs are in the stack\r\n" );
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document.write( "This problem involves the SUM of an AP (Arithmetic Progression)/AS (Arithmetic Sequence), and is\r\n" );
document.write( "denoted by the following formula: \"matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%28a%5B1%5D+%2B+a%5Bn%5D%29%29\", where:\r\n" );
document.write( "                                         \"S%5Bn%5D\" = Sum of the AP/AS (UNKNOWN, in this case).\r\n" );
document.write( "                                          \"n\" = Number of terms/rows (10, in this case).\r\n" );
document.write( "                                         \"a%5B1%5D\" = First term/row (15, in this case).\r\n" );
document.write( "                                         \"a%5Bn%5D\" = Last term/row (24, in this case).\r\n" );
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document.write( "                                         \"matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%28a%5B1%5D+%2B+a%5Bn%5D%29%29\" now becomes:\r\n" );
document.write( "                                        \"matrix%281%2C3%2C+S%5B10%5D%2C+%22=%22%2C+%2810%2F2%29%2815+%2B+24%29%29\"\r\n" );
document.write( "Sum of this AP/AS, or 
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