document.write( "Question 568361: find the sum of the integers 1to50 inclusive \n" ); document.write( "
Algebra.Com's Answer #366926 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Let the sum be S\r\n" );
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document.write( " S =  1 +  2 +  3 + ... + 48 + 49 + 50   <-- there are 50 terms\r\n" );
document.write( " S = 50 + 49 + 48 + ... +  3 +  2 +  1   <-- there are 50 terms\r\n" );
document.write( "  \r\n" );
document.write( "add the two equations term by term:\r\n" );
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document.write( " S =  1 +  2 +  3 + ... + 48 + 49 + 50   <-- there are 50 terms\r\n" );
document.write( " S = 50 + 49 + 48 + ... +  3 +  2 +  1   <-- there are 50 terms\r\n" );
document.write( "2S = 51 + 51 + 51 + ... + 51 + 51 + 51   <-- there are 50 terms\r\n" );
document.write( "2S = 51×50  <--51 times 50 because there are 50 51's added together                           \r\n" );
document.write( "2S = 2550\r\n" );
document.write( " S = 1275 \r\n" );
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document.write( "Or by formula: \"n%28n%2B1%29%2F2\"\r\n" );
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document.write( "\"50%2850%2B1%29%2F2\" = 1275\r\n" );
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document.write( "Edwin
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