Flip Number!
Number Theory
Level
1
A is three digit number and B is the flip number of A, then which of the following is must be divisor of A-B (A>B)?
4
9
5
7
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1 solution
A is the three digits number is like that xyz= 100x+10y+z
B is the flip number of A, that is like as zyx=100z+10y+x
Then A-B = 100x+10y+z-100z-10y-x =99x-99z = 9(11x-11z) that is multiply of 9.