document.write( "Question 41932: Find S(n) for the arithmetic series in which a(1)=-11, a(n)=13, and n=7.\r
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Algebra.Com's Answer #27074 by venugopalramana(3286) $\"\"$ $\"About$

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Find S(n) for the arithmetic series in which a(1)=-11, a(n)=13, and n=7.
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\n" ); document.write( "SN=(N/2){A1+AN}=(7/2)(-11+13)=7 \n" ); document.write( "

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