document.write( "Question 618264: Please help me solve the question:\r
\n" ); document.write( "\n" ); document.write( "Find the sum of all the multiples of seven between 18 and 711\r
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Algebra.Com's Answer #388800 by MathTherapy(10552)\"\" \"About 
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Please help me solve the question:\r
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\n" ); document.write( "\n" ); document.write( "Since the multiples of 7 that are between 18 and 711 start at \"21\"(7 * 3), and end at \"707\"(7 * 101), then the smallest number is \"21\", and the largest number is \"707\" in the series
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\n" ); document.write( "\n" ); document.write( "Additionally, the number of numbers with a difference of 7 between them, which starts at 21 and ends at 707, inclusive, is computed as follows: \"%28707+-+21+%2B+7%29%2F7\", or \"693%2F7\", or \"99\"\r
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\n" ); document.write( "\n" ); document.write( "The sum of a series of numbers can be found by applying the following formula:
\n" ); document.write( "\"S%5Bn%5D+=+%28n%2F2%29%28a%5B1%5D+%2B+a%5B2%5D%29\", with n being the number of numbers; and \"a%5B1%5D\" and \"a%5B2%5D\" being the smallest and largest numbers in the series, respectively\r
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\n" ); document.write( "\n" ); document.write( "\"S%5B99%5D+=+%2899%2F2%29%2821+%2B+707%29\" ---- Substituting 99 for n; 21 for \"a%5B1%5D\" and 707 for \"a%5B2%5D\", respectively\r
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\n" ); document.write( "\n" ); document.write( "\"S%5B99%5D+=+%2849.5%29%28728%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"highlight_green%28S%5B99%5D+=+36036%29\"\r
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\n" ); document.write( "\n" ); document.write( "Send comments and “thank-yous” to “D” at MathMadEzy@aol.com
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