document.write( "Question 911236: Find the value of the series 11+13+15+...+61. \n" ); document.write( "
Algebra.Com's Answer #552959 by MathLover1(20850)\"\" \"About 
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\"11%2B13%2B15%2B...%2B61\"\r
\n" ); document.write( "\n" ); document.write( "formula:\"a%5Bn%5D=%282n%2B9%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=%282n%2B9%29\" => \"a%5B1%5D=%282%2A1%2B9%29=11\"\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=%282n%2B9%29\" => \"a%5B2%5D=%282%2A2%2B9%29=13\"\r
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\n" ); document.write( "\n" ); document.write( "if \"2%2An%2B9=61\" => \"2%2An=61-9\"=> \"2%2An=52\"=> \"n=26\"; so, there are \"26\" terms in this sequence and\r
\n" ); document.write( "\n" ); document.write( "\"sum%28+%282n%2B9%29%2C+n=1%2C+26+%29=+936\"
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