Coggi wrote:
Why is it not C ?
We don't know how many integer there is in the set...
Maybe it's a set of 10 intergers, maybe a set of 500 ? Thus with 1) and 2) we know for sure 100 is in K
What am I missing ?
Hi
Coggi,
Option A alone is SUFFICIENT. If 50 is in the set, then 51, 52,..,100,...,to the infinity must be in the same set. 100% sure, and no additional data is even necessary.
Of course, option (C) must not be correct answer, because in Option (C), Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
One golden rule of thumb in DS is not to make any own assumption other than stated in the question stem. For this case, the question doesn't state nor explicitly indicate that there are finite number of the set.