AP ICET 2016 Paper

‘a’ and ‘b’ are two distinct two-digit numbers that share the same digits.
I. Given : Difference between digits = 7
⇒ (a, b) = (18, 81) (29, 92)
⇒ a, b and hence a + b can’t be uniquely determined .
∴ I alone is not sufficient.
II. Given :|a–b|=63
Let the two digit number be xy.
⇒|(10x+y)–(10y+x)|=63
⇒ | 9 (x – y)|= 63 ⇒ | x – y| =7
The information obtained is same as from statement I.
∴ Neither I alone nor II alone nor I & II together are sufficient.