My home has a four digit number, none of the digit is repeated, one day a mischievous person turns the sign upside down. I find out that new number is 720 less than the old one. What was the orginial number?
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My home has a four digit number, none of the digit is repeated, one day a mischievous person turns the sign upside down. I find out that new number is 720 less than the old one. What was the orginial number?
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