Difference between revisions of "2005 Alabama ARML TST Problems/Problem 4"
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Revision as of 14:44, 17 November 2006
Problem
For how many ordered pairs of digits is a multiple of 12?
Solution
We wish for . Thus . Let ; ,, one of the eqns. must be true: 2 ways 3 4 4 3 2 ways Total of 18 ways.