What a magic number 7 is! It can reverse the digit sequence of a 4 digit number. A, B, C, D and E are distinct single digit numbers. What is the 4 digit number ABCD?
Saturday, October 2, 2010
009. Reverse the number by multiplying 7
What a magic number 7 is! It can reverse the digit sequence of a 4 digit number. A, B, C, D and E are distinct single digit numbers. What is the 4 digit number ABCD?
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