2011 AIME II Problems/Problem 6: Difference between revisions
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Define an ordered quadruple (a, b, c, d) as interesting if <math>1< | Define an ordered quadruple (a, b, c, d) as interesting if <math>1=<a<b<c<d=<10</math>. | ||
Revision as of 21:39, 30 March 2011
Define an ordered quadruple (a, b, c, d) as interesting if 
.
