121255884255#
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It is 99. 99*99 = 9801
10 10 x 10 = 100
From left to right, pick the smallest possible digit every time. This will give you the smallest possible number.
I hope you would multiply 15 by 4 if you want to get 60 to give to me.
Two digit no and the sum of the two digit give 12 39,48,57,66,75,84,93 are the possible two digit no whose sum is 12. Example 3+9=12;4+8=12...... Difference of the two digit no is 2 that is 57and75. because difference of 5 and 7 is 2. Next, unit digit to be greater than tens digit. So 57 is ans because 7 is in unit digit which is greater than tens digit.