Ian, could you please help me to understand following type of DS questions?

Questions stem:

Is X an even integer?

(1) X can be even or odd >> Insufficient

(2) X can be even or decimal

Here, I get confused. As (2) says X either Even or Decimal. Since a decimal is not an integer, the only useful information is that X is even..So the information about X being decimal is useless. Then, isn't (2) enough to answer this question?

http://www.gmatclub.com/phpbb/viewtopic ... ght=#48814 is one of these type of questions ...

Please help...