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counting and probability junior

Problem

How many three-digit positive integers have an odd number of even digits?
(A)
(B)
(C)
(D)
Solution
We use simple case work to solve this problem. Case 1: even, even, even = Case 2: even, odd, odd = Case 3: odd, even, odd = Case 4: odd, odd, even = Simply sum up the cases to get your answer. .
Final answer
D