Difference between revisions of "Mock AIME 1 2006-2007 Problems/Problem 15"
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Revision as of 15:47, 24 July 2006
15. Let 
be the set of integers 
. An element 
(in) is chosen at random. Let 
denote the sum of the digits of 
. The probability that 
is divisible by 11 is 
where 
and 
are relatively prime positive integers. Compute the last 3 digits of 
