Difference of a 3-digit number and its digit swap: 99(X - Z) or 90(X - Y)

1. A.
   9
2. B.
   8
3. C.
   7
4. D.
   6

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1. A.
   0
2. B.
   1
3. C.
   7
4. D.
   9

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1. A.
   The Question can be answered by using one of the statements alone, but cannot be answered using the other statement alone
2. B.
   The Question can be answered by using either Statement alone
3. C.
   The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone
4. D.
   The Question can be answered even without using both the Statements

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