document.write( "Question 988472: 1 + 2 + ... + 80 \n" ); document.write( "

Algebra.Com's Answer #609023 by Alan3354(69443) $\"\"$ $\"About$

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1 + 2 + ... + 80
\n" ); document.write( "---------------
\n" ); document.write( "There are 80 elements.
\n" ); document.write( "The average is (1+80)/2 = 40.5
\n" ); document.write( "--> 80*40.5
\n" ); document.write( "= 3240
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