The sum of the digits of 2digit number is 11 reversing the digit result to a new number that is 9 less than the original.
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Let X and y be the numbers at unit and tenth places
X+Y=11
probabilities r
9+2/7+4/5+6/8+3/1+10/
The condition is the difference between the actual and interchanged no is 9
56 agrees this condition
X+Y=11
probabilities r
9+2/7+4/5+6/8+3/1+10/
The condition is the difference between the actual and interchanged no is 9
56 agrees this condition
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