document.write( "Question 380157: Find the sum of the first n terms of the following arithmetic sequence.\r
\n" ); document.write( "\n" ); document.write( "a1 = 2, d = 2; n = 5.
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Algebra.Com's Answer #269828 by rfadrogane(214)\"\" \"About 
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Find the sum of the first n terms of the following arithmetic sequence.\r
\n" ); document.write( "\n" ); document.write( "a1 = 2, d = 2; n = 5.
\n" ); document.write( " Sol'n:
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\n" ); document.write( " S = n/2[2a1+(n-1)d]
\n" ); document.write( " = (5/2)[2(2)+(5-1)2]
\n" ); document.write( " = (5/2)[4+8]
\n" ); document.write( " = (5/2)(12)
\n" ); document.write( " S = 30 --answer
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