If 1 is subtracted from every even digit in each of the numbers, how many numbers thus formed will have a digit appear twice?

If 1 is subtracted from every even digit in each of the numbers, how m

1.	If 1 is subtracted from every even digit in each of the numbers, how many numbers thus formed will have a digit appear twice?
A.	None
B.	More than three
C.	One
D.	Three
Answer» E.

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