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Hi,
Today my friend asked me a question.I couldn't find answer and i am not sure that there is a correct one. But he says there is.
Question:
Find a number that if you swap first and last digit you will get two times bigger number (example: 2*abcdef=fbcdea)
Do you have any idea?
Hints:
-number is 18 digit
-first digit is even number
-last digit is odd number
-only one of digits is zero
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