document.write( "Question 1104646: Given the sequence 5,8,11 find the sum from the 13th to 53rd numbers inclusive\r
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Algebra.Com's Answer #719376 by Fombitz(32388)\"\" \"About 
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First value : 5
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\n" ); document.write( "\"S%5Bn%5D=%28n%2F2%29%282a%5B1%5D%2B%28n-1%29d%29\"
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\n" ); document.write( "So then,
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