2005 Alabama ARML TST Problems/Problem 4
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.
For how many ordered pairs of digits is a multiple of 12?
We wish for . Thus . Let ; ,, one of the eqns. must be true:
2 ways
3
4
4
3
2 ways
Total of 18 ways.
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