How many four-digit positive integers x are there with the property that x and 3x have only even digits? (One such number is x=8002, since 3x=24006 and each of x and 3x has only even digits.)
Answer Choices
A. 82
B. 84
C. 86
D. 88
E. 90
How many four-digit positive integers x are there with the property that x and 3x have only even digits? (One such number is x=8002, since 3x=24006 and each of x and 3x has only even digits.)
Answer Choices
A. 82
B. 84
C. 86
D. 88
E. 90