If n is an integer, is n even?

1) 2n is an even integer
2) n – 1 is an odd integer

For each statement alone and if needed combined, think:
- Can n be odd?
- Can n be even?
Then apply logic of data sufficiency questions.

This is quite a straightforward question, especially considering statement (2). So you need to go over number properties and odd/even topics again. Then practice some more questions of this type until you feel confident with the topics.