How many of
each
of these
digits
2's 3's 4's Four-digit numbers Total
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0 0 4 4444 1
0 1 3 3444, 4344, 4434, 4443 4
0 2 2 3344, 3434, 3443, 4334, 4343, 4433 6
1 0 3 3233, 3323, 3332 3
1 1 2 3244, 3424, 3442, 4234, 4243, 4324, 4342, 4423, 4432 9
1 2 1 3234, 3243, 3324, 3342, 3423, 3432, 4233, 4323, 4332 9
2 0 2 4224, 4242, 4422 3
2 1 1 3224, 3242, 3422, 4223, 4232, 4322 6
2 2 0 3223, 3232, 3322 3
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Grand total = 44
Edwin
