the digit at the unit place of a two digit number is one more than the digit at tens place if 9 is added to the number digit get inter changed find the number
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ans : 01
sol : 01 + 9 = 10
here when nine is added to 01 digits inter change to 10
sol : 01 + 9 = 10
here when nine is added to 01 digits inter change to 10
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