document.write( "Question 1184396: Find the sum of the infinite series (1 + 2 + 3 + 4 + .... + r-1) divided by r! where r is from $\"+2+to+inf+\"$ ?
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Algebra.Com's Answer #814963 by ikleyn(52915) $\"\"$ $\"About$

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document.write( "The sum   1 + 2 + 3 + . . . + (r-1)  is  .\r\n" );
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document.write( "This sum divided by  r! is  .\r\n" );
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document.write( "So, the problem asks about this sum  .\r\n" );
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document.write( "It is the same as the expression  .\r\n" );
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document.write( "The last expression value is  ,  where  \"e\"  is the base of natural logarithms.\r\n" );
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document.write( "ANSWER.  The requested sum is equal to   =  = 1.35914  (rounded).\r\n" );
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