agdimple333 wrote:
i think answer is A. 1st statement should be sufficient. Since its given that all digits are unique, B has to be 9. ex - 2930, 3940, 4950, 5960, etc.
B is not sufficient. C & D could be 1 & 2 resp and B can be than 4,5,6 etc.
I think B is required here -
A -> AB = CD+1 such as- 9798, 9091, 9596, 7273 (all these rounded to nearest 100th will give CD00 but not necessarily have "9" as B).
but here if you take into consideration B> C+D then only "9" fits the Bill. Such as- 8990, 7980, 1920, 3940...
I hope it's clear now so C is my bet!